§ 50.15. National primary and secondary ambient air quality standards for ozone.
120 words·~1 min read·
/us/cfr/t40/s§ 50.15·A research copy — for the controlling text, always check the official state or federal source. Not legal advice.
(a)The level of the national 8-hour primary and secondary ambient air quality standards for ozone
(O3)is 0.075 parts per million (ppm), daily maximum 8-hour average, measured by a reference method based on appendix D to this part and designated in accordance with part 53 of this chapter or an equivalent method designated in accordance with part 53 of this chapter.
(b)The 8-hour primary and secondary O3 ambient air quality standards are met at an ambient air quality monitoring site when the 3-year average of the annual fourth-highest daily maximum 8-hour average O3 concentration is less than or equal to 0.075 ppm, as determined in accordance with appendix P to this part. [73 FR 16511, Mar. 27, 2008]
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§ 50.15
National primary and secondary ambient air quality standards for ozone.
Fed. Reg.×173
C.F.R.×2
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