Agenda Item III-1_Draft Rule 15A NCAC 02D .0410

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15A NCAC 02D .0410 is proposed for amendment as follows: 1
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15A NCAC 02D .0410 PM2.5 PARTICULATE MATTER 3
(a) The national primary ambient air quality standards for PM2.5 shall be 12.0 9.0 micrograms per cubic meter (µg/m3) 4
annual arithmetic mean concentration and 35 µg/m3 24-hour average concentration measured in the ambient air as 5
PM2.5 (particles with an aerodynamic diameter less than or equal to a nominal 2.5 micrometers) by either: 6
(1) A reference method based on appendix L to 40 CFR Part 50 and designated in accordance with 40 7
CFR Part 53; or 8
(2) An equivalent method designated in accordance with 40 CFR Part 53. 9
(b) The primary annual PM2.5 standard shall be deemed met when the annual arithmetic mean concentration, as 10
determined in accordance with Appendix N of 40 CFR Part 50, is less than or equal to 12.0 9.0 µg/m3. 11
(c) The primary 24-hour PM2.5 standard shall be deemed met when the 98th percentile 24-hour concentration, as 12
determined in accordance with Appendix N of 40 CFR Part 50, is less than or equal to 35 µg/m3. 13
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History Note: Authority G.S. 143-215.3(a)(1); 143-215.107(a)(3); 15
Eff. April 1, 1999; 16
Amended Eff. September 1, 2015; January 1, 2010; 17
Readopted Eff. January 1, 2018. 2018; 18
Amended Eff. 19
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