40 CFR 50.12 - National primary and secondary ambient air quality standards for lead.

§ 50.12 National primary and secondary ambient air quality standards for lead.

(a) National primary and secondary ambient air quality standards for lead and its compounds, measured as elemental lead by a reference method based on appendix G to this part, or by an equivalent method, are: 1.5 micrograms per cubic meter, maximum arithmetic mean averaged over a calendar quarter.

(b) The standards set forth in this section will remain applicable to all areas notwithstanding the promulgation of lead national ambient air quality standards (NAAQS) in § 50.16. The lead NAAQS set forth in this section will no longer apply to an area one year after the effective date of the designation of that area, pursuant to section 107 of the Clean Air Act, for the lead NAAQS set forth in § 50.16; except that for areas designated nonattainment for the lead NAAQS set forth in this section as of the effective date of § 50.16, the lead NAAQS set forth in this section will apply until that area submits, pursuant to section 191 of the Clean Air Act, and EPA approves, an implementation plan providing for attainment and/or maintenance of the lead NAAQS set forth in § 50.16.

(Secs. 109, 301(a) Clean Air Act as amended ( 42 U.S.C. 7409, 7601(a)))
[ 43 FR 46258, Oct. 5, 1978, as amended at 73 FR 67051, Nov. 12, 2008]

This is a list of United States Code sections, Statutes at Large, Public Laws, and Presidential Documents, which provide rulemaking authority for this CFR Part.

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United States Code

Title 40 published on 2015-08-22

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

  • 2017-02-15; vol. 82 # 30 - Wednesday, February 15, 2017
    1. 82 FR 10726 - Response to December 9, 2013, Clean Air Act Section 176A Petition From Connecticut, Delaware, Maryland, Massachusetts, New Hampshire, New York, Pennsylvania, Rhode Island and Vermont
      GPO FDSys XML | Text
      ENVIRONMENTAL PROTECTION AGENCY
      Notice of public hearing and extension of comment period.
      Public Hearing. The public hearing will be held on March 14, 2017, in Washington, DC. Please refer to SUPPLEMENTARY INFORMATION section for additional information on the public hearing. Comments. Comments must be received on or before April 13, 2017.
      40 CFR Parts 50 and 51