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Northern Mariana Islands—TSP
1 EPA designation only.
Northern Mariana Islands—1971 Sulfur Dioxide NAAQS
[Primary and Secondary]
Northern Mariana Islands—2010 Sulfur Dioxide NAAQS
[Primary]
1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.
2 This date is April 9, 2018, unless otherwise noted.
Northern Mariana Islands—Carbon Monoxide
1 This date is November 15, 1990, unless otherwise noted.
Northern Mariana Islands—Ozone (1-Hour Standard) 2
1 This date is October 18, 2000, unless otherwise noted.
2 The 1-hour ozone standard is revoked effective June 15, 2005 for all areas in Northern Mariana Islands.
Northern Mariana Islands—1997 Annual PM2.5 NAAQS
a Includes Indian Country located in each county or area, except as otherwise specified.
1 This date is 90 days after January 5, 2005, unless otherwise noted.
Northern Mariana Islands—2012 Annual PM2.5 NAAQS
1 Includes areas of Indian country located in each county or area, except as otherwise specified.
2 This date is April 15, 2015, unless otherwise noted.
Northern Mariana Islands—1997 24-Hour PM2.5 NAAQS
aIncludes Indian Country located in each county or area, except as otherwise specified.
1This date is 90 days after January 5, 2005, unless otherwise noted.
Northern Mariana Islands—2006 24-Hour PM2.5 NAAQS
1 This date is 30 days after November 13, 2009, unless otherwise noted.
Northern Mariana Islands—NO2 (1971 Annual Standard)
Northern Mariana Islands—NO2 (2010 1-Hour Standard)
1 This date is 90 days after October 31, 2011, unless otherwise noted.
Northern Mariana Islands—1997 8-Hour Ozone NAAQS
1 This date is June 15, 2004, unless otherwise noted.
Northern Mariana Islands—2008 8-Hour Ozone NAAQS
1 This date is July 20, 2012, unless otherwise noted.
Northern Mariana Islands—2015 8-Hour Ozone NAAQS
2 This date is January 16, 2018, unless otherwise noted.
Northern Mariana Islands—2008 Lead NAAQS
1 December 31, 2011 unless otherwise noted.