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

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There is 1 Update appearing in the Federal Register for 40 CFR Part 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 2014-07-01.

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.

  • 2015-03-06; vol. 80 # 44 - Friday, March 6, 2015
    1. 80 FR 12264 - Implementation of the 2008 National Ambient Air Quality Standards for Ozone: State Implementation Plan Requirements
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      ENVIRONMENTAL PROTECTION AGENCY
      Final rule.
      This final rule is effective on April 6, 2015.
      40 CFR Parts 50, 51, 52, 70, and 71

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United States Code

Title 40 published on 2014-07-01

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

  • 2015-04-03; vol. 80 # 64 - Friday, April 3, 2015
    1. 80 FR 18177 - Fine Particulate Matter National Ambient Air Quality Standards: State Implementation Plan Requirements
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      ENVIRONMENTAL PROTECTION AGENCY
      Notice of public hearing and extension of comment period.
      Public Hearing. The public hearing will be held on April 29, 2015, in Washington, DC Please refer to SUPPLEMENTARY INFORMATION for additional information on the public hearing. Comments . Comments must be received on or before May 29, 2015.
      40 CFR Parts 50, 51, and 93