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GAO-10-457R 1 (2010-02-24)

handle is hein.gao/gaobadxac0001 and id is 1 raw text is: im T I IAccountability * Integrity * Reliability United States Government Accountability Office Washington, DC 20548 B-319328 February 24, 2010 The Honorable Barbara Boxer Chairman The Honorable James M. Inhofe Ranking Minority Member Committee on Environment and Public Works United States Senate The Honorable Henry A. Waxman Chairman The Honorable Joe L. Barton Ranking Minority Member Committee on Energy and Commerce House of Representatives Subject: Environmental Protection Agency. Primary National Ambient Air Quality Standards for Nitrogen Dioxide Pursuant to section 801(a)(2)(A) of title 5, United States Code, this is our report on a major rule promulgated by the Environmental Protection Agency (EPA), entitled Primary National Ambient Air Quality Standards for Nitrogen Dioxide (RIN: 2060- Au19). We received the rule on January 27, 2010. It was published in the Federal Register as a final rule on February 9, 2010. 75 Fed. Reg. 6474. The final rule is effective on April 12, 2010. The final rule revises the primary nitrogen dioxide national ambient air quality standards in order to provide requisite protection of public health. The final rule establishes a new 1-hour standard at a level of 100 ppb, based on the 3-year average of the 98' percentile of the yearly distribution of 1-hour daily maximum concentrations, to supplement the existing annual standard. The final rule also establishes requirements for a nitrogen dioxide monitoring network that will include monitors at locations where maximum nitrogen dioxide concentrations are expected, including within 50 meters of major roadways, as well as monitors sited to measure the area-wide nitrogen dioxide concentrations that occur more broadly across communities. Enclosed is our assessment of the EPA's compliance with the procedural steps required by section 801(a)(1)(B)(i) through (iv) of title 5 with respect to the rule. GAO-10-457R

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