Code of Federal Regulations > Title 40 > Chapter I > Part 51 > Subpart A > Appendix Appendix A - Appendix A to Subpart A of Part 51

Regulations last checked for updates: Nov 22, 2024

Title 40 - Protection of Environment last revised: Nov 20, 2024

Appendix Appendix A - Appendix A to Subpart A of Part 51—Tables

Table 1 to Appendix A of Subpart A—Emission Thresholds ¹ by Pollutant for Treatment as Point Source Under 40 CFR 51.30

Pollutant	Every-year	Triennial
Pollutant	Type A sources ²	Type B sources	NAA sources ³
(1) SO2	≥2500	≥100	≥100.
			PM2.5 (Serious) ≥70.
(2) VOC	≥250	≥100	≥100.
		within OTR ⁴ ≥50	within OTR ≥50.
			O3 (Serious) ≥50.
			O3 (Severe) ≥25.
			O3 (Extreme) ≥10.
			PM2.5 (Serious) ≥70.
(3) NOX	≥2500	≥100	≥100.
			O3 (Serious) ≥50.
			O3 (Severe) ≥25.
			O3 (Extreme) ≥10.
			PM2.5 (Serious) ≥70.
(4) CO	≥2500	≥1000	≥1000.
			CO (all areas) ≥100.
(5) Lead		≥0.5 (actual)	≥0.5 (actual).
(6) Primary PM10	≥250	≥100	≥100.
			PM10 (Serious) ≥70.
(7) Primary PM2.5	≥250	≥100	≥100.
			PM2.5 (Serious) ≥70.
(8) NH3	≥250	≥100	≥100.
			PM2.5 (Serious) ≥70.

¹ Thresholds for point source determination shown in tons per year of potential to emit as defined in 40 CFR part 70, with the exception of lead. Reported emissions should be in actual tons emitted for the required time period.

² Type A sources are a subset of the Type B sources and are the larger emitting sources by pollutant.

³ NAA = Nonattainment Area. The point source reporting thresholds vary by attainment status for SO2, VOC, NOX, CO, PM10, PM2.5, and NH3.

⁴ OTR = Ozone Transport Region (see 40 CFR 51.1300(k)).

Table 2a to Appendix A of Subpart A—Facility Inventory ¹ Data Elements for Reporting Emissions From Point Sources, Where Required by 40 CFR 51.30

Data elements
(1) Emissions Year.
(2) State and County FIPS Code or Tribal Code.
(3) Facility Site Identifier.
(4) Unit Identifier.
(5) Emission Process Identifier.
(6) Release Point Identifier.
(7) Facility Site Name.
(8) Physical Address (Location Address, Locality Name, State and Postal Code).
(9) Latitude and Longitude at facility level.
(10) Source Classification Code.
(11) Aircraft Engine Type (where applicable).
(12) Facility Site Status and Year.
(13) Release Point Stack Height and Unit of Measure.
(14) Release Point Stack Diameter and Unit of Measure.
(15) Release Point Exit Gas Temperature and Unit of Measure.
(16) Release Point Exit Gas Velocity or Release Point Exit Gas Flow Rate and Unit of Measure.
(17) Release Point Status and Year.
(18) NAICS at facility level.
(19) Unit Design Capacity and Unit of Measure (for some unit types).
(20) Unit Type.
(21) Unit Status and Year.
(22) Release Point Apportionment Percent.
(23) Release Point Type.
(24) Control Measure and Control Pollutant (where applicable).
(25) Percent Control Approach Capture Efficiency (where applicable).
(26) Percent Control Measures Reduction Efficiency (where applicable).
(27) Percent Control Approach Effectiveness (where applicable).

¹ Facility Inventory data elements need only be reported once to the EIS and then revised if needed. They do not need to be reported for each triennial or every-year emissions inventory.

Table 2b to Appendix A of Subpart A—Data Elements for Reporting Emissions From Point, Nonpoint, Onroad Mobile and Nonroad Mobile Sources, Where Required by 40 CFR 51.30

Data elements	Point	Nonpoint	Onroad	Nonroad
(1) Emissions Year	Y	Y	Y	Y
(2) FIPS code	Y	Y	Y	Y
(3) Shape Identifiers (where applicable)		Y
(4) Source Classification Code		Y	Y	Y
(5) Emission Type (where applicable)		Y	Y	Y
(8) Emission Factor	Y	Y
(9) Throughput (Value, Material, Unit of Measure, and Type)	Y	Y	Y
(10) Pollutant Code	Y	Y	Y	Y
(11) Annual Emissions and Unit of Measure	Y	Y	Y	Y
(12) Reporting Period Type (Annual)	Y	Y	Y	Y
(13) Emission Operating Type (Routine)	Y
(14) Emission Calculation Method	Y	Y
(15) Control Measure and Control Pollutant (where applicable)		Y
(16) Percent Control Measures Reduction Efficiency (where applicable)		Y
(17) Percent Control Approach Effectiveness (where applicable)		Y
(18) Percent Control Approach Penetration (where applicable)		Y

[73 FR 76552, Dec. 17, 2008, as amended at 80 FR 8796, Feb. 19, 2015; 81 FR 58149, Aug. 24, 2016; 83 FR 63031, Dec. 6, 2018]

authority: 23 U.S.C. 101; 42 U.S.C. 7401-7671q.

source: 36 FR 22398, Nov. 25, 1971, unless otherwise noted.