40 CFR 50.15 - National primary and secondary ambient air quality standards for ozone.

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There is 1 rule appearing in the Federal Register for 40 CFR 50. View below or at eCFR (GPOAccess)
§ 50.15 National primary and secondary ambient air quality standards for ozone.
(a) The level of the national 8-hour primary and secondary ambient air quality standards for ozone (O[=E T=8052]3) 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 O[=E T=8052]3 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 O[=E T=8052]3 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]

Title 40 published on 2013-07-01

The following are only the Rules published in the Federal Register after the published date of Title 40.

For a complete list of all Rules, Proposed Rules, and Notices view the Rulemaking tab.

  • 2013-07-03; vol. 78 # 128 - Wednesday, July 3, 2013
    1. 78 FR 40000 - Method for the Determination of Lead in Total Suspended Particulate Matter
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      ENVIRONMENTAL PROTECTION AGENCY
      Final rule.
      This final rule is effective on August 2, 2013.
      40 CFR Part 50

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United States Code

Title 40 published on 2013-07-01

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 40 CFR 50 after this date.

  • 2014-02-13; vol. 79 # 30 - Thursday, February 13, 2014
    1. 79 FR 8644 - Notice of Workshop in Support of the Review of the Secondary National Ambient Air Quality Standards for Oxides of Nitrogen and Sulfur
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      ENVIRONMENTAL PROTECTION AGENCY
      Notice of workshop.
      The workshop will be held March 4-6, 2014. The pre-registration deadline is February 28, 2014.
      40 CFR Part 50