N.C. Department of Environment and Natural Resources
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15A NCAC 02D .0405 OZONE



The ambient air quality standard for ozone measured by a reference method based on Appendix D of 40 CFR Part 50 and designated according to 40 CFR Part 53 is 0.075 parts per million (ppm), daily maximum 8-hour average. The standard is attained at an ambient air quality monitoring site when the average of the annual fourth-highest daily maximum 8-hour average ozone concentration is less than or equal to 0.075 parts per million (ppm) as determined by Appendix P of 40 CFR Part 50, or equivalent methods established under 40 CFR Part 53.



History Note:



Authority G.S. 143-215.3(a)(1); 143-215.107(a)(3); Eff. February 1, 1976; Amended Eff. January 1, 2010; April 1, 1999; July 1, 1984; July 1, 1979; December 1, 1976.






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Last Modified: Tue Jan 19 07:24:18 2010
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