C.F.R. » Title 40 » CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY › SUBCHAPTER C—AIR PROGRAMS › PART 50—NATIONAL PRIMARY AND SECONDARY AMBIENT AIR QUALITY STANDARDS

40 C.F.R. § 50.15

National primary and secondary ambient air quality standards for ozone

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(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]
Notes of Decisions
Cited in 7 cases (3 in the last 5 years), 2012–2023 · leading case: Indiana v. Environmental Protection Agency
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Indiana v. Environmental Protection Agency (2015) ca7 “40 C.F.R. § 50.15 . The purpose of SIPs is to “provide! ] for implementation, maintenance, and enforcement of [the NAAQS] in each air quality *806 control region (or portion thereof) within” a state.”
WildEarth Guardians v. U.S. Bureau of Land Mgmt. (2018) cod · cites it 2× “" 40 C.F.R. § 50.15 (a). 3 Whether a region meets the standard is judged by asking whether "the 3-year average of the annual fourth-highest daily maximum 8-hour average [ozone] concentration is less than or equal to 0.”
Town of Superior v. United States Fish & Wildlife Service (2012) cod “27, 2008) (to be codified at 40 C.F.R. § 50.15 ). Under the rule, the EPA was required to issue designations of non-attainment areas by March 2010 and states were required to submit State Implementation Plans by March 2011.”
Defend Colorado v. Governor Jared Polis (2021) coloctapp “40 C.F.R. § 50.15 (b) (2021). An area with a design value above the NAAQS is designated as being in “nonattainment” and given an “attainment date” by which it must attain the NAAQS.”
State of New York v. EPA (2020) cadc “40 C.F.R. § 50.15 . And in 2015, it promulgated an even more restrictive ozone standard of 70 parts per billion.”
WildEarth Guardians v. N.M. Env't Improvement Bd. (2023) nmctapp “” 40 C.F.R. § 50.15 (b). Estimating quantities 10 of ozone that a proposed facility will emit is complicated by the fact that ozone is 11 not a direct emission.”
WildEarth Guardians v. N.M. Env't Improvement Bd. (2023) nmctapp “” 40 C.F.R. § 50.15 (b). Estimating quantities of ozone that a proposed facility will emit is complicated by the fact that ozone is not a direct emission.”
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