(a) Purpose and scope. This section sets forth the applicable State implementation plan for Maryland under section 110 of the Clean Air Act, 42 U.S.C. 7410,and.

(b) Incorporation by reference. (1) Material listed in paragraphs (c) and (d) of this section with an EPA approval date prior to December 26, 2018, was approved for incorporation by reference by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Entries in paragraphs (c) and (d) of this section with the EPA approval dates after December 26, 2018 for the State of Maryland, have been approved by EPA for inclusion in the State implementation plan and for incorporation by reference into the plan as it is contained in this section, and will be considered by the Director of the Federal Register for approval in the next update to the SIP compilation.

(2) EPA Region III certifies that the following materials provided by EPA at the addresses in paragraph (b)(3) of this section are an exact duplicate of the officially promulgated State rules/regulations which have been approved as part of the State implementation plan as of the dates referenced in paragraph (b)(1) of this section.

(3) Copies of the materials incorporated by reference into the State implementation plan may be inspected at the Environmental Protection Agency, Region III, 1650 Arch Street, Philadelphia, Pennsylvania 19103. To obtain the material, please call the Regional Office at (215) 814-3376. You may also inspect the material with an EPA approval date prior to December 26, 2018 for the State of Maryland at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202-741-6030, or go to: http://www.archives.gov/federal-register/cfr/ibr-locations.html.

(c) EPA approved regulations.

(d) EPA approved state source-specific requirements.

(e) EPA-approved nonregulatory and quasi-regulatory material.

The Maryland plans were evaluated on the basis of the following classifications:

(a) With the exceptions set forth in this subpart, the Administrator approves Maryland's plans for the attainment and maintenance of the national standards.

(b)-(g) [Reserved]

(a) EPA approves as a revision to the Maryland State Implementation Plan the 1990 base year emission inventory for the Baltimore Metropolitan Statistical Area, submitted by the Secretary, Maryland Department of the Environment, on September 20, 1995. This submittal consists of the 1990 base year stationary, area, off-road mobile and on-road mobile emission inventories in the Baltimore Metropolitan Statistical Area for the pollutant, carbon monoxide (CO).

(b) EPA approves as a revision to the Maryland Implementation Plan the 1990 base year emission inventory for the Washington Metropolitan Statistical Area, submitted by Secretary, Maryland Department of the Environment, on March 21, 1994 and October 12, 1995. This submittal consist of the 1990 base year stationary, area and off-road mobile and on-road mobile emission inventories in the Washington Statistical Area for the pollutant, carbon monoxide (CO).

(c) EPA approves as a revision to the Maryland State Implementation Plan the 1990 base year emission inventories for the Maryland ozone nonattainment areas submitted by the Secretary of Maryland Department of Environment on March 21, 1994. This submittal consists of the 1990 base year point, area, non-road mobile, biogenic and on-road mobile source emission inventories for the following pollutants: volatile organic compounds (VOC), carbon monoxide (CO), and oxides of nitrogen (NOX).

(d) EPA approves as a revision to the Maryland State Implementation Plan the 1990 base year emission inventories for the Maryland ozone nonattainment areas: Baltimore nonattainment areas, Cecil County, and Kent and Queen Anne's Counties submitted by the Secretary of Maryland Department of Environment on March 21, 1994. This submittal consists of the 1990 base year point, area, non-road mobile, biogenic and on-road mobile source emission inventories for the following pollutants: volatile organic compounds (VOC), carbon monoxide (CO), and oxides of nitrogen (NOX).

(e) EPA approves as a revision to the Maryland State Implementation Plan the 1990 base year emission inventory for the Maryland portion of the Metropolitan Washington DC ozone nonattainment area submitted by the Secretary of MDE on March 21, 1994. This submittal consists of the 1990 base year point, area, highway mobile, non-road mobile, and biogenic source emission inventories in the area for the following pollutants: Volatile organic compounds (VOC), carbon monoxide (CO), and oxides of nitrogen (NOX).

(f) EPA approves as a revision to the Maryland State Implementation Plan an amendment to the 1990 base year emission inventories for the Maryland portion of the Metropolitan Washington DC ozone nonattainment area submitted by the Secretary of Maryland of the Department Environment on December 24, 1997. This submittal consists of amendments to the 1990 base year point, area, highway mobile, and non-road mobile source emission inventories in the area for the following pollutants: Volatile organic compounds (VOC), and oxides of nitrogen (NOX).

(g) EPA approves revisions to the Maryland State Implementation Plan amending the 1990 base year emission inventories for the Baltimore ozone nonattainment area, submitted by the Secretary of Maryland Department of the Environment on December 24, 1997. This submittal consists of amendments to the 1990 base year point, area, highway mobile and non-road mobile source emission inventories for volatile organic compounds and nitrogen oxides in the Baltimore ozone nonattainment area.

(h) EPA approves revisions to the Maryland State Implementation Plan amending the 1990 base year emission inventories for the Cecil County portion of the Philadelphia-Wilmington-Trenton ozone nonattainment area, submitted by the Secretary of the Maryland Department of the Environment on December 24, 1997. This submittal consists of amendments to the 1990 base year point, area, highway mobile and non-road mobile source emission inventories for volatile organic compounds and nitrogen oxides in the Cecil County portion of the Philadelphia-Wilmington-Trenton ozone nonattainment area.

(i) EPA approves as a revision to the Maryland State Implementation Plan the 2002 base year emissions inventories for the Baltimore 1997 8-hour ozone moderate nonattainment area submitted by the Secretary of the Maryland Department of the Environment on June 4, 2007. This submittal consists of the 2002 base year point, area, non-road mobile, and on-road mobile source inventories in area for the following pollutants: Volatile organic compounds (VOC), carbon monoxide (CO) and nitrogen oxides (NOX).

(j) EPA approves as a revision to the Maryland State Implementation Plan the 2002 base year emissions inventories for the Maryland portion of the Philadelphia 1997 8-hour ozone moderate nonattainment area submitted by the Secretary of the Maryland Department of the Environment on June 4, 2007. This submittal consists of the 2002 base year point, area, non-road mobile, and on-road mobile source inventories in area for the following pollutants: volatile organic compounds (VOC), carbon monoxide (CO) and nitrogen oxides (NOX).

(k) EPA approves as a revision to the Maryland State Implementation Plan the 2002 base year emissions inventories for the Washington DC-MD-VA 1997 8-hour ozone moderate nonattainment area submitted by the Secretary of the Maryland Department of the Environment on June 4, 2007. This submittal consists of the 2002 base year point, area, non-road mobile, and on-road mobile source inventories in area for the following pollutants: volatile organic compounds (VOC), carbon monoxide (CO) and nitrogen oxides (NOX).

(l) EPA approves as a revision to the Maryland State Implementation Plan the 2002 base year emissions inventory for the Maryland portion of the Washington DC-MD-VA 1997 fine particulate matter (PM2.5) nonattainment area submitted by the Maryland Department of Environment on April 3, 2008. The 2002 base year emissions inventory includes emissions estimates that cover the general source categories of point sources, non-road mobile sources, area sources, on-road mobile sources, and biogenic sources. The pollutants that comprise the inventory are nitrogen oxides (NOX), volatile organic compounds (VOCs), PM2.5, coarse particles (PM10), ammonia (NH3), and sulfur dioxide (SO2).

(m) EPA approves as a revision to the Maryland State Implementation Plan the 2002 base year emissions inventory for the Washington County, Maryland 1997 fine particulate matter (PM2.5) nonattainment area submitted by the Maryland Department of Environment on June 6, 2008. The 2002 base year emissions inventory includes emissions estimates that cover the general source categories of point sources, non-road mobile sources, area sources, on-road mobile sources, and biogenic sources. The pollutants that comprise the inventory are nitrogen oxides (NOX), volatile organic compounds (VOCs), PM2.5, coarse particles (PM10), ammonia (NH3), and sulfur dioxide (SO2).

(n) EPA approves as a revision to the Maryland State Implementation Plan the 2002 base year emissions inventory for the Baltimore, Maryland 1997 fine particulate matter (PM2.5) nonattainment area submitted by the Maryland Department of Environment on June 6, 2008. The 2002 base year emissions inventory includes emissions estimates that cover the general source categories of point sources, non-road mobile sources, area sources, on-road mobile sources, and biogenic sources. The pollutants that comprise the inventory are nitrogen oxides (NOX), volatile organic compounds (VOCs), PM2.5, coarse particles (PM10), ammonia (NH3), and sulfur dioxide (SO2).

(o) EPA approves as a revision to the Maryland State Implementation Plan the 2011 base year emissions inventory for the Maryland portion of the Washington, DC-MD-VA 2008 8-hour ozone nonattainment area submitted by the Maryland Department of Environment on August 4, 2014. The 2011 base year emissions inventory includes emissions estimates that cover the general source categories of point sources, non-road mobile sources, area sources, on-road mobile sources, and biogenic sources. The pollutants that comprise the inventory are carbon monoxide (CO), nitrogen oxides (NOX) and volatile organic compounds (VOC).

(p) EPA approves, as a revision to the Maryland State Implementation Plan, updates to the 2002 base year emissions inventories previously approved under paragraph (i) of this section for the Baltimore 1997 8-hour ozone serious nonattainment area (Area) submitted by the Secretary of the Maryland Department of the Environment on July 22, 2013. This submittal consists of updated 2002 base year point, area, non-road mobile, and on-road mobile source inventories in the Area for the following pollutants: Volatile organic compounds (VOC), carbon monoxide (CO) and nitrogen oxides (NOX).

(q) EPA approves, as a revision to the Maryland state implementation plan the 2011 base year emissions inventory for the Maryland portion of the Philadelphia-Wilmington-Atlantic City marginal nonattainment area for the 2008 8-hour ozone national ambient air quality standards submitted by the Maryland Department of the Environment on January 19, 2017, as amended July 20, 2017. The 2011 base year emissions inventory includes emissions estimates that cover the general source categories of stationary point, area (nonpoint), nonroad mobile, onroad mobile, and Marine-Air-Rail (M-A-R). The inventory included actual annual emissions and typical summer day emissions for the months of May through September for the ozone precursors, VOC and NOX.

(r) EPA approves as a revision to the Maryland state implementation plan the 2011 base year emissions inventory for the Baltimore, Maryland moderate nonattainment area for the 2008 8-hour ozone national ambient air quality standards submitted by the Maryland Department of the Environment on December 30, 2016. The 2011 base year emissions inventory includes emissions estimates that cover the general source categories of stationary point, quasi-point, area (nonpoint), nonroad mobile, onroad mobile, and Marine-Air-Rail (M-A-R). The inventory includes actual annual emissions and typical summer day emissions for the months of May through September for the ozone precursors, VOC and NOX.

(a) EPA is approving as a revision to the Maryland State Implementation Plan the 15 Percent Rate of Progress Plan and associated contingency measures for the Cecil County ozone nonattainment area, submitted by the Secretary of the Maryland Department of the Environment on July 21, 1995.

(b) EPA approves as a revision to the Maryland State Implementation Plan, the Stage II vapor recovery comparability plan for the counties of Allegany, Caroline, Dorchester, Garrett, Kent, Queen Anne's, Somerset, St. Mary's, Talbot, Washington, Wicomico, and Worcester Counties submitted by the Maryland Department of the Environment on November 5, 1997.

(c) EPA approves as a revision to the Maryland State Implementation Plan, the 15 Percent Rate of Progress Plan for the Baltimore ozone nonattainment area, submitted by the Secretary of Maryland Department of the Environment on October 7, 1998.

(d) EPA approves the Maryland's 15 Percent Rate of Progress Plan for the Maryland portion of the Metropolitan Washington, D.C. ozone nonattainment area, submitted by the Secretary of the Maryland Department of the Environment on May 5, 1998.

(e) [Reserved]

(f)(1) EPA approves revisions to the Maryland State Implementation Plan for post 1996 rate of progress plans for milestone years 1999, 2002 and 2005 for the Cecil County portion of the Philadelphia-Wilmington-Trenton ozone nonattainment area. These revisions were submitted by the Secretary of the Maryland Department of the Environment on December 24, 1997, as revised on April 24 and August 18, 1998, December 21, 1999 and December 28, 2000.

(2) EPA approves the contingency plans for failure to meet rate of progress in the Cecil County portion of the Philadelphia-Wilmington-Trenton ozone nonattainment area for milestone years 1999, 2002 and 2005. These plans were submitted by the Secretary of the Maryland Department of the Environment on December 24, 1997, as revised on April 24 and August 18, 1998, December 21, 1999 and December 28, 2000.

(3) EPA approves revisions to the Maryland State Implementation Plan, submitted by the Secretary of the Maryland Department of the Environment on March 8, 2004, for the rate-of-progress (ROP) plan for year 2005 for the Cecil County portion of the Philadelphia-Wilmington-Trenton 1-hour ozone nonattainment area. These revisions update Cecil County's 2005 ROP plan's 1990 and 2005 motor vehicle emissions inventories and motor vehicle emissions budgets to reflect the use of the MOBILE6 emissions model, establish motor vehicle emissions budgets of 3.0 tons per day (tpd) of volatile organic compounds and 11.3 tpd of nitrogen oxides, and amend the contingency measures associated with the 2005 ROP plan for Cecil County.

(g) [Reserved]

(h) EPA approves the attainment demonstration for the Philadelphia area submitted as a revision to the State Implementation Plan by the Maryland Department of the Environment on April 29, 1998, August 18, 1998, December 21, 1999, December 28, 2000, August 31, 2001, and September 2, 2003 including its RACM analysis and determination. EPA is also approving the revised enforceable commitments made to the attainment plan for the Baltimore severe ozone nonattainment area which were submitted on December 28, 2000. The enforceable commitments are to submit measures by October 31, 2001 for additional emission reductions as required in the attainment demonstration test, and to revise the SIP and motor vehicle emissions budgets by October 31, 2001 if the additional measures affect the motor vehicle emissions inventory; and to perform a mid-course review by December 31, 2003.

(i) EPA approves the following mobile budgets of Maryland's attainment plan for the Philadelphia area:

(1) [Reserved]

(2) Similarly, EPA is approving the 2005 attainment demonstration and its current budgets because Maryland has provided an enforceable commitment to submit new budgets as a SIP revision to the attainment plan consistent with any new measures submitted to fill any shortfall, if the new additional control measures affect on-road motor vehicle emissions.

(j)(1) EPA approves revisions to the Maryland State Implementation Plan for post 1996 rate of progress plans for milestone years 1999, 2002 and 2005 for the Baltimore severe ozone nonattainment area. These revisions were submitted by the Secretary of the Maryland Department of the Environment on December 24, 1997, as revised on April 24 and August 18, 1998, December 21, 1999 and December 28, 2000.

(2) EPA approves the contingency plans for failure to meet rate of progress in the Baltimore severe ozone nonattainment area for milestone years 1999, 2002 and 2005. These plans were submitted by the Secretary of the Maryland Department of the Environment on December 24, 1997, as revised on April 24 and August 18, 1998, December 21, 1999 and December 28, 2000.

(k) EPA approves the attainment demonstration for the Baltimore area submitted as a revision to the State Implementation Plan by the Maryland Department of the Environment on April 29, 1998, August 18, 1998, December 21, 1999, December 28, 2000, August 20, 2001, and September 2, 2003 including its RACM analysis and determination. EPA is also approving the revised enforceable commitments made to the attainment plan for the Baltimore severe ozone nonattainment area which were submitted on December 28, 2000. The enforceable commitments are to submit measures by October 31, 2001 for additional emission reductions as required in the attainment demonstration test, and to revise the SIP and motor vehicle emissions budgets by October 31, 2001 if the additional measures affect the motor vehicle emissions inventory; and to perform a mid-course review by December 31, 2003.

(l) EPA approves the following mobile budgets of the Baltimore area attainment plan:

(1) [Reserved]

(2) Similarly, EPA is approving the 2005 attainment demonstration and its current budgets because Maryland has provided an enforceable commitment to submit new budgets as a SIP revision to the attainment plan consistent with any new measures submitted to fill any shortfall, if the new additional control measures affect on-road motor vehicle emissions.

(m) EPA approves the State of Maryland's revised 1990 and the 2005 VOC and NOX highway mobile emissions inventories and the 2005 motor vehicle emissions budgets for the one-hour ozone attainment plans for the Baltimore severe ozone nonattainment area and the Cecil County portion of the Philadelphia-Wilmington-Trenton severe ozone nonattainment area. These revisions were submitted by the Maryland Department of the Environment on September 2, 2003. Submission of these revised MOBILE6-based motor vehicle emissions inventories was a requirement of EPA's approval of the attainment demonstration under paragraphs (h) and (k) of this section.

(n) EPA approves revisions to the Maryland State Implementation Plan for Post-1996 Rate of Progress (ROP) Plans for the Baltimore severe 1-hour ozone nonattainment area. These revisions were submitted by the Secretary of the Maryland Department of the Environment on December 23, 2003 and consist of the following:

(1) Revisions to the base year 1990 emissions inventory which reflect the use of the MOBILE6 motor vehicle emissions model. These revisions establish motor vehicle emissions inventories for 1990 of 165.14 tons per day of volatile organic compounds (VOC) and 228.21 tons per day of oxides of nitrogen (NOX).

(2) Revisions to the year 2005 motor vehicle emissions budgets (MVEBs) for transportation conformity purposes, reflecting the use of the MOBILE6 motor vehicle emissions model. These revisions establish a motor vehicle emissions budget of 55 tons per day of volatile organic compounds (VOC) and 144.5 tons per day of oxides of nitrogen (NOX). EPA approved new 2005 MOBILE6-based MVEBs for the Baltimore area's 1-hour ozone attainment demonstration on October 27, 2003 (68 FR 61106). Those MVEBs became effective on November 26, 2003. The approved 2005 attainment plan MVEBs budgets are 55.3 tons per day of VOC and 146.9 tons per day of NOX. The MVEBs of the 2005 ROP plan are less than the MVEBs in the approved attainment demonstration. These more restrictive MVEBs, contained in the ROP plan, are the applicable MVEBs to be used in transportation conformity demonstrations for the year 2005 for the Baltimore area.

(3) Revisions to the 2005 ROP plan to reallocate some of the contingency measures established in prior SIP revisions to the control measures portion of the plan. EPA guidance allows states an additional year to adopt new contingency measures to replace those reallocated to the control measures portion of the plan. The State of Maryland's December 23, 2003 SIP revision submittal includes an enforceable commitment to replace those contingency measures reallocated to the control measures portion of the 2005 ROP plan and to submit these additional contingency measures by October 31, 2004.

(o) Based upon EPA's review of the air quality data for the 3-year period 2003 to 2005, EPA has determined that the Washington, DC severe 1-hour ozone nonattainment area attained the 1-hour ozone NAAQS by the applicable attainment date of November 15, 2005. EPA also has determined that the Washington, DC severe 1-hour ozone nonattainment area is not subject to the imposition of the section 185 penalty fees.

(p) Based upon EPA's review of the air quality data for the 3-year period 2003 to 2005, EPA has determined that that the Philadelphia-Wilmington-Trenton severe 1-hour ozone nonattainment area attained the 1-hour ozone NAAQS by the applicable attainment date of November 15, 2005. EPA also has determined that the Philadelphia-Wilmington-Trenton severe 1-hour ozone nonattainment area is not subject to the imposition of the section 185 penalty fees.

(q) EPA approves revisions to the Maryland State Implementation Plan consisting of the 2008 reasonable further progress (RFP) plan, reasonably available control measures, and contingency measures for the Baltimore 1997 8-hour ozone moderate nonattainment area submitted by the Secretary of the Maryland Department of the Environment on June 4, 2007.

(r) EPA approves the following 2008 RFP motor vehicle emissions budgets (MVEBs) for the Baltimore 1997 8-hour ozone moderate nonattainment area submitted by the Secretary of the Maryland Department of the Environment on June 4, 2007:

(s) EPA approves revisions to the Maryland State Implementation Plan consisting of the 2008 reasonable further progress (RFP) plan, reasonably available control measures, and contingency measures for the Maryland portion of the Philadelphia 1997 8-hour ozone moderate nonattainment area submitted by the Secretary of the Maryland Department of the Environment on June 4, 2007.

(t) EPA approves the following 2008 RFP motor vehicle emissions budgets (MVEBs) for the Maryland portion of the Philadelphia 1997 8-hour ozone moderate nonattainment area submitted by the Secretary of the Maryland Department of the Environment on June 4, 2007:

(u) EPA approves revisions to the Maryland State Implementation Plan consisting of the 2008 reasonable further progress (RFP) plan, reasonably available control measures, and contingency measures for the Washington DC-MD-VA 1997 8-hour ozone moderate nonattainment area submitted by the Secretary of the Maryland Department of the Environment on June 4, 2007.

(v) EPA approves the following 2008 RFP motor vehicle emissions budgets (MVEBs) for the Washington, DC-MD-VA 1997 8-hour ozone moderate nonattainment area submitted by the Director of the Virginia Department of Environment Quality on June 12, 2007:

(w) EPA has determined, as of February 28, 2012, that based on 2007 to 2009 and 2008 to 2010 ambient air quality data, the Washington, DC-MD-VA moderate nonattainment area has attained the 1997 8-hour ozone National Ambient Air Quality Standard (NAAQS). This determination, in accordance with 40 CFR 51.918, suspends the requirements for this area to submit an attainment demonstration, associated reasonably available control measures, a reasonable further progress plan, contingency measures, and other planning SIPs related to attainment of the standard for as long as this area continues to meet the 1997 8-hour ozone NAAQS.

(x) EPA has determined, as of March 26, 2012, that based on 2008 to 2010 ambient air quality data, Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE 8-hour ozone moderate nonattainment area has attained the 1997 8-hour ozone NAAQS. This determination, in accordance with 40 CFR 51.918, suspends the requirements for this area to submit an attainment demonstration, associated reasonably available control measures, a reasonable further progress plan, contingency measures, and other planning SIPs related to attainment of the standard for as long as this area continues to meet the 1997 annual 8-hour ozone NAAQS.

(y) Determination—EPA has determined that, as of July 12, 2012, the Baltimore 1-hour ozone nonattainment area has attained the 1-hour ozone standard and that this determination obviates the requirement for Maryland to submit for the Baltimore area the 1-hour ozone contingency measure requirements of section 172(c)(9) of the Clean Air Act.

(z) EPA approves the attainment demonstration portion of the attainment plan for the 1997 8-hour ozone NAAQS for the Philadelphia Area submitted as a revision to the State Implementation Plan by the Secretary of the Maryland Department of the Environment on June 4, 2007. EPA also approves the 2009 motor vehicle emissions budgets associated with the attainment demonstration for Cecil County, Maryland.

(aa) EPA approves revisions to the Maryland State Implementation Plan consisting of the attainment demonstration required under 40 CFR 51.908 demonstrating attainment of the 1997 ozone NAAQS by the applicable attainment date of June 15, 2010 and the failure to attain contingency measures for the Washington, DC-MD-VA 1997 8-hour ozone moderate nonattainment area submitted by the Secretary of the Maryland Department of the Environment on June 4, 2007.

(bb) EPA approves the following 2009 attainment demonstration and 2010 motor vehicle emissions budgets (MVEBs) for the Washington, DC-MDVA 1997 8-hour ozone moderate nonattainment area submitted by the Secretary of the Maryland Department of the Environment on June 4, 2007:

(cc) EPA approves revisions to the Maryland State Implementation Plan consisting of the serious area reasonable further progress (RFP) plan for the Baltimore 1997 8-hour ozone serious nonattainment area, including 2011 and 2012 RFP milestones, updates to the 2008 RFP milestones previously approved by EPA under paragraph (q) of this section, and contingency measures for failure to meet 2012 RFP, submitted by the Secretary of the Maryland Department of the Environment on July 22, 2013.

(dd) EPA approves the following 2012 RFP motor vehicle emissions budgets (MVEBs) for the Baltimore 1997 8-hour ozone serious nonattainment area, in tons per day (tpd) of volatile organic compounds (VOC) and nitrogen oxides (NOX), submitted by the Secretary of the Maryland Department of the Environment on July 22, 2013:

(ee) EPA approves the maintenance plan for the Maryland portion of the Washington, DC-MD-VA nonattainment area for the 2008 8-hour ozone NAAQS submitted by the Secretary of the Maryland Department of the Environment on February 5, 2018. The maintenance plan includes 2014, 2025, and 2030 motor vehicle emission budgets (MVEBs) for VOC and NOX to be applied to all future transportation conformity determinations and analyses for the entire Washington, DC-MD-VA area for the 2008 8-hour ozone NAAQS. The maintenance plan includes two sets of VOC and NOX MVEBs: The MVEBs without transportation buffers are effective as EPA has determined them adequate for transportation conformity purposes; the MVEBs with transportation buffers will be used only as needed in situations where the conformity analysis must be based on different data, models, or planning assumptions, including, but not limited to, updates to demographic, land use, or project-related assumptions, than were used to create the set of MVEBs without transportation buffers. The technical analyses used to demonstrate compliance with the MVEBs and the need, if any, to use transportation buffers will be fully documented in the conformity analysis and follow the Transportation Planning Board's (TPB) interagency consultation procedures.

(ff) The EPA has determined that the Baltimore, Maryland Moderate nonattainment area attained the 2008 8-hour ozone National Ambient Air Quality Standards by the applicable attainment date of July 20, 2018, based upon complete quality-assured and certified data for the calendar years 2015-2017.

(gg) EPA is disapproving Maryland's October 16, 2019, State Implementation Plan (SIP) revision intended to address the Clean Air Act (CAA) section 110(a)(2)(D)(i)(I) interstate transport requirements for the 2015 8-hour ozone national ambient air quality standard (NAAQS).

(hh) EPA approves updates to the 2008 8-Hour Ozone national ambient air quality standard (NAAQS) maintenance plan for the Maryland portion of the Washington, DC-MD-VA 2008 8-Hour Ozone NAAQS Maintenance Area. The updates include revised motor vehicle emissions budgets (MVEBs) and updates to the applicable onroad and nonroad mobile emissions for VOC and NOX for the years 2025 and 2030. EPA also approves the allocation of a portion of the safety margins for VOC and NOX in the ozone maintenance plan to the 2025 and 2030 MVEBs. The revised MVEBs for VOC and NOX applies to all future transportation conformity determinations and analyses for the entire Washington, DC-MD-VA Maintenance Area for the 2008 8-Hour Ozone NAAQS.

On March 24, 1994 Maryland's Department of the Environment submitted a plan for the establishment and implementation of a Photochemical Assessment Monitoring Stations (PAMS) Program as a state implementation plan (SIP) revision, as required by section 182(c)(1) of the Clean Air Act. EPA approved the Photochemical Assessment Monitoring Stations (PAMS) Program on September 11, 1995 and made it part of Maryland SIP. As with all components of the SIP, Maryland must implement the program as submitted and approved by EPA.

(a) Determination of Attainment. EPA has determined, as of January 12, 2009, the Maryland portion of the Metropolitan Washington, DC-MD-VA nonattainment area for the 1997 PM2.5 NAAQS has attained the 1997 PM2.5 NAAQS. This determination, in accordance with 40 CFR 52.1004(c), suspends the requirements for this area to submit an attainment demonstration and associated reasonably available control measures, a reasonable further progress plan, contingency measures, and other planning SIPs related to attainment of the standard for as long as the area continues to attain the 1997 PM2.5 NAAQS.

(b) Determination of Attainment. EPA has determined, as of November 20, 2009, the Martinsburg-Hagerstown, WV-MD PM2.5 nonattainment area has attained the 1997 PM2.5 NAAQS. This determination, in accordance with 40 CFR 52.1004(c), suspend the requirements for this area to submit an attainment demonstration, associated reasonably available control measures, a reasonable further progress plan, contingency measures, and other planning SIPs related to attainment of the standard for as long as this area continues to meet the 1997 PM2.5 NAAQS.

(c) Determination of Attainment. EPA has determined, as of May 22, 2012, based on ambient air quality data of 2008 to 2010 and the preliminary data of 2011, that the PM2.5 nonattainment area of Baltimore, Maryland has attained the 1997 annual PM2.5 NAAQS. This determination, in accordance with 40 CFR 51.1004(c), suspends the requirements for this area to submit an attainment demonstration, associated reasonably available control measures, a reasonable further progress plan, contingency measures, and other planning SIPs related to attainment of the standard for as long as this area continues to meet the 1997 annual PM2.5 NAAQS.

(d) Maintenance Plan and Transportation Conformity Budgets. EPA approves the maintenance plan for the Maryland portion of the Washington, DC-MD-VA nonattainment area for the 1997 annual PM2.5 NAAQS submitted by the State of Maryland for the entire Area on July 10, 2013 and supplemented on July 26, 2013. The maintenance plan includes motor vehicle emission budgets (MVEBs) to be applied to all future transportation conformity determinations and analyses for the entire Washington, DC-MD-VA PM2.5 Area for the 1997 PM2.5 NAAQS. The MVEBs are based on a tiered approach: Tier 1 MVEBs are effective as EPA has determined them adequate for transportation conformity purposes; Tier 2 mobile budgets will become effective upon the completion of the interagency consultation process and fully documented within the first conformity analysis that uses the Tier 2 MVEBs.

(e) Maintenance Plan and Transportation Conformity Budgets. EPA approves the maintenance plan for the Baltimore, MD nonattainment area for the 1997 annual PM2.5 NAAQS submitted by the State of Maryland on December 12, 2013. The maintenance plan includes motor vehicle emission budgets (MVEBs) to be applied to all future transportation conformity determinations and analyses for the Baltimore, MD Area for the 1997 PM2.5 NAAQS.

(f) Maintenance Plan and Transportation Conformity Budgets. EPA approves the maintenance plan for the Maryland portion of the Martinsburg, WV-Hagerstown, MD nonattainment area for the 1997 annual PM2.5 NAAQS submitted by the State of Maryland on December 12, 2013. The maintenance plan includes motor vehicle emission budgets (MVEBs) to be applied to all future transportation conformity determinations and analyses for the Maryland portion of the Martinsburg, WV-Hagerstown, MD Area for the 1997 PM2.5 NAAQS.

(a) Based upon EPA's review of the air quality data for the 3-year period 2007 to 2009, EPA determined that the Metropolitan Washington, District of Columbia-Maryland-Virginia (DC-MD-VA) fine particle (PM2.5) nonattainment area attained the 1997 annual PM2.5 National Ambient Air Quality Standard (NAAQS) by the applicable attainment date of April 5, 2010. Therefore, EPA has met the requirement pursuant to CAA section 179(c) to determine, based on the area's air quality as of the attainment date, whether the area attained the standard. EPA also determined that the Metropolitan Washington, DC-MD-VA nonattainment area is not subject to the consequences of failing to attain pursuant to section 179(d).

(b) Based upon EPA's review of the air quality data for the 3-year period 2007 to 2009, EPA determined that the Martinsburg-Hagerstown, West Virginia-Maryland (WV-MD) fine particle (PM2.5) nonattainment area attained the 1997 annual PM2.5 National Ambient Air Quality Standard (NAAQS) by the applicable attainment date of April 5, 2010. Therefore, EPA has met the requirement pursuant to CAA section 179(c) to determine, based on the area's air quality as of the attainment date, whether the area attained the standard. EPA also determined that the Martinsburg-Hagerstown, WV-MD nonattainment area is not subject to the consequences of failing to attain pursuant to section 179(d).

(c) Based upon EPA's review of the air quality data for the 3-year period 2007 to 2009, Washington, DC-MD-VA moderate nonattainment area has attained the 1997 8-hour ozone NAAQS by the applicable attainment date of June 15, 2010. Therefore, EPA has met the requirement pursuant to CAA section 181(b)(2)(A) to determine, based on the area's air quality as of the attainment date, whether the area attained the standard. EPA also determined that the Washington, DC-MD-VA moderate nonattainment area will not be reclassified for failure to attain by its applicable attainment date pursuant to section 181(b)(2)(A).

(d) Based upon EPA's review of the air quality data for the 3-year period 2008 to 2010, EPA determined that Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE 8-hour ozone moderate nonattainment area (the Philadelphia Area) attained the 1997 8-hour ozone National Ambient Air Quality Standard (NAAQS) by the applicable attainment date of June 15, 2011. Therefore, EPA has met the requirement pursuant to CAA section 181(b)(2)(A) to determine, based on the area's air quality as of the attainment date, whether the area attained the standard. EPA also determined that the Philadelphia Area nonattainment area will not be reclassified for failure to attain by its applicable attainment date under section 181(b)(2)(A).

(e) Based upon EPA's review of the air quality data for the 3-year period 2007 to 2009, EPA determined that the PM2.5 nonattainment area of Baltimore, Maryland attained the 1997 annual PM2.5 NAAQS by the applicable attainment date of April 5, 2010. Therefore, EPA has met the requirement pursuant to CAA section 179(c) to determine, based on the area's air quality as of the attainment date, whether the area attained the NAAQS. EPA has also determined that the PM2.5 nonattainment area of Baltimore, Maryland is not subject to the consequences of failing to attain pursuant to section 179(d).

(f) Based upon EPA's review of the air quality data for the 3-year period 2003 to 2005, EPA determined, as of July 12, 2012, that the Baltimore 1-hour ozone nonattainment area did not attain the 1-hour ozone standard as of its applicable 1-hour ozone attainment date of November 15, 2005.

(g) Based on 2009-2011 complete, quality-assured ozone monitoring data at all monitoring sites in the Baltimore 1-hour ozone nonattainment area, EPA determined, as of July 12, 2012, that the Baltimore 1-hour ozone nonattainment area has attained the 1-hour ozone standard.

(h) EPA has determined, as of May 26, 2015, that based on 2012 to 2014 ambient air quality data, the Baltimore nonattainment area has attained the 1997 8-hour ozone NAAQS. This determination, in accordance with 40 CFR 51.1118, suspends the requirement for this area to submit an attainment demonstration, associated reasonably available control measures, a reasonable further progress plan, contingency measures, and other planning SIPs related to attainment of the standard for as long as this area continues to meet the 1997 8-hour ozone NAAQS.

(i) EPA has determined, as of June 1, 2015, that based on 2012 to 2014 ambient air quality data, the Baltimore nonattainment area has attained the 2008 8-hour ozone NAAQS. This determination, in accordance with 40 CFR 51.1118, suspends the requirement for this area to submit an attainment demonstration, associated reasonably available control measures, a reasonable further progress plan, contingency measures, and other planning SIPs related to attainment of the standard for as long as this area continues to meet the 2008 8-hour ozone NAAQS.

(j) Based upon EPA's review of the air quality data for the 3-year period 2013 to 2015, Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE marginal ozone nonattainment area has attained the 2008 8-hour ozone national ambient air quality standard (NAAQS) by the applicable attainment date of July 20, 2016. Therefore, EPA has met the requirement pursuant to CAA section 181(b)(2)(A) to determine, based on the area's air quality as of the attainment date, whether the area attained the standard. EPA also determined that the Philadelphia-Wilmington-Atlantic City, PA-NJ-MD-DE marginal ozone nonattainment area will not be reclassified for failure to attain by its applicable attainment date pursuant to section 181(b)(2)(A).

(k) Based upon EPA's review of the air quality data for the 3-year period 2013 to 2015, the Washington, DC-MD-VA marginal ozone nonattainment area has attained the 2008 8-hour ozone national ambient air quality standard (NAAQS) by the applicable attainment date of July 20, 2016. Therefore, EPA has met the requirement pursuant to Clean Air Act section 181(b)(2)(A) to determine, based on the area's air quality as of the attainment date, whether the area attained the standard. EPA also determined that the Washington, DC-MD-VA marginal nonattainment area will not be reclassified for failure to attain by its applicable attainment date pursuant to section 181(b)(2)(A).

(l) EPA has determined, as of November 2, 2022, that based on 2019 to 2021 ambient air quality monitoring data and air dispersion modeling, the Anne Arundel-Baltimore County nonattainment area has attained the 2010 1-hour sulfur dioxide NAAQS. This clean data determination suspends the requirement for this area to submit an attainment demonstration, associated reasonably available control measures, a reasonable further progress plan, contingency measures, and other sulfur dioxide NAAQS attainment plan SIP elements for as long as this area continues to meet the 2010 1-hour sulfur dioxide NAAQS.

(a)(1) The owner and operator of each source and each unit located in the State of Maryland and for which requirements are set forth under the CSAPR NOX Annual Trading Program in subpart AAAAA of part 97 of this chapter must comply with such requirements. The obligation to comply with such requirements will be eliminated by the promulgation of an approval by the Administrator of a revision to Maryland's State Implementation Plan (SIP) as correcting the SIP's deficiency that is the basis for the CSAPR Federal Implementation Plan under § 52.38(a), except to the extent the Administrator's approval is partial or conditional.

(2) Notwithstanding the provisions of paragraph (a)(1) of this section, if, at the time of the approval of Maryland's SIP revision described in paragraph (a)(1) of this section, the Administrator has already started recording any allocations of CSAPR NOX Annual allowances under subpart AAAAA of part 97 of this chapter to units in the State for a control period in any year, the provisions of subpart AAAAA of part 97 of this chapter authorizing the Administrator to complete the allocation and recordation of CSAPR NOX Annual allowances to units in the State for each such control period shall continue to apply, unless provided otherwise by such approval of the State's SIP revision.

(b)(1) The owner and operator of each source and each unit located in the State of Maryland and for which requirements are set forth under the CSAPR NOX Ozone Season Group 1 Trading Program in subpart BBBBB of part 97 of this chapter must comply with such requirements with regard to emissions occurring in 2015 and 2016.

(2) The owner and operator of each source and each unit located in the State of Maryland and for which requirements are set forth under the CSAPR NOX Ozone Season Group 2 Trading Program in subpart EEEEE of part 97 of this chapter must comply with such requirements with regard to emissions occurring in 2017 through 2020.

(3) The owner and operator of each source and each unit located in the State of Maryland and for which requirements are set forth under the CSAPR NOX Ozone Season Group 3 Trading Program in subpart GGGGG of part 97 of this chapter must comply with such requirements with regard to emissions occurring in 2021 and each subsequent year. The obligation to comply with such requirements will be eliminated by the promulgation of an approval by the Administrator of a revision to Maryland's State Implementation Plan (SIP) as correcting the SIP's deficiency that is the basis for the CSAPR Federal Implementation Plan (FIP) under § 52.38(b)(1) and (b)(2)(iii), except to the extent the Administrator's approval is partial or conditional.

(4) Notwithstanding the provisions of paragraph (b)(3) of this section, if, at the time of the approval of Maryland's SIP revision described in paragraph (b)(3) of this section, the Administrator has already started recording any allocations of CSAPR NOX Ozone Season Group 3 allowances under subpart GGGGG of part 97 of this chapter to units in the State for a control period in any year, the provisions of subpart GGGGG of part 97 of this chapter authorizing the Administrator to complete the allocation and recordation of CSAPR NOX Ozone Season Group 3 allowances to units in the State for each such control period shall continue to apply, unless provided otherwise by such approval of the State's SIP revision.

(5) Notwithstanding the provisions of paragraph (b)(2) of this section, after 2020 the provisions of § 97.826(c) of this chapter (concerning the transfer of CSAPR NOX Ozone Season Group 2 allowances between certain accounts under common control), the provisions of § 97.826(d) of this chapter (concerning the conversion of amounts of unused CSAPR NOX Ozone Season Group 2 allowances allocated for control periods before 2021 to different amounts of CSAPR NOX Ozone Season Group 3 allowances), and the provisions of § 97.811(d) of this chapter (concerning the recall of CSAPR NOX Ozone Season Group 2 allowances equivalent in quantity and usability to all such allowances allocated to units in the State for control periods after 2020) shall continue to apply.

(6) Notwithstanding any other provision of this part, the effectiveness of paragraph (b)(3) of this section is stayed with regard to emissions occurring in 2024 and thereafter, provided that while such stay remains in effect, the provisions of paragraph (b)(2) of this section shall apply with regard to such emissions.

(c)(1) The owner and operator of each source located in the State of Maryland and for which requirements are set forth in § 52.40 and § 52.41, § 52.42, § 52.43, § 52.44, § 52.45, or § 52.46 must comply with such requirements with regard to emissions occurring in 2026 and each subsequent year.

(2) Notwithstanding any other provision of this part, the effectiveness of paragraph (c)(1) of this section is stayed.

(a) The owner and operator of each source and each unit located in the State of Maryland and for which requirements are set forth under the CSAPR SO2 Group 1 Trading Program in subpart CCCCC of part 97 of this chapter must comply with such requirements. The obligation to comply with such requirements will be eliminated by the promulgation of an approval by the Administrator of a revision to Maryland's State Implementation Plan (SIP) as correcting the SIP's deficiency that is the basis for the CSAPR Federal Implementation Plan under § 52.39, except to the extent the Administrator's approval is partial or conditional.

(b) Notwithstanding the provisions of paragraph (a) of this section, if, at the time of the approval of Maryland's SIP revision described in paragraph (a) of this section, the Administrator has already started recording any allocations of CSAPR SO2 Group 1 allowances under subpart CCCCC of part 97 of this chapter to units in the State for a control period in any year, the provisions of subpart CCCCC of part 97 of this chapter authorizing the Administrator to complete the allocation and recordation of CSAPR SO2 Group 1 allowances to units in the State for each such control period shall continue to apply, unless provided otherwise by such approval of the State's SIP revision.

(a) This section identifies the original “Air Implementation Plan for the State of Maryland” and all revisions submitted by Maryland that were federally approved prior to November 1, 2004. The information in this section is available in the 40 CFR, part 52, Volume 2 of 2 (§§ 52.1019 to the end of part 52) editions revised as of July 1, 2005 through July 1, 2011, and the 40 CFR, part 52, Volume 2 of 3 (§§ 52.1019 to 52.2019) edition revised as of July 1, 2012.

(b) [Reserved]

On November 13, 1992, the Acting Director of the Air and Radiation Management Administration, Maryland Department of the Environment submitted a plan for the establishment and implementation of a Small Business Stationary Source Technical and Environmental Compliance Assistance Program as a state implementation plan (SIP) revision, as required by title V of the Clean Air Act Amendments. EPA approved the Small Business Stationary Source Technical and Environmental Compliance Assistance Program on May 16, 1994, and made it part of the Maryland SIP. As with all components of the SIP, Maryland must implement the program as submitted and approved by EPA.

(a) The requirements of sections 160 through 165 of the Clean Air Act are not met, since the plan does not include approvable procedures for preventing the significant deterioration of air quality.

(b) The following provisions of 40 CFR 52.21 are hereby incorporated and made a part of the applicable State plan for the State of Maryland.

(1) Definition of federally enforceable (40 CFR 52.21(b)(17)),

(2) Exclusions from increment consumption (40 CFR 52.21(f)(1)(v), (3), (4)(i)),

(3) Redesignation of areas (40 CFR 52.21(g) (1), (2), (3), (4), (5), and (6)),

(4) Approval of alternate models (40 CFR 52.21(1)(2)),

(5) Disputed permits or redesignation (40 CFR 52.21(t), and

(6) Delegation of Authority (40 CFR 52.21(u)(1), (2)(ii), (3), and (4)).

(a) [Reserved]

(b) The requirements of § 51.112(a) of this chapter are not met because the State did not submit an adequate control strategy demonstration to show that the Maryland Regulation 10.03.36.04B (1) and (2) would not interfere with the attainment and maintenance of the national sulfur dioxide standards.