National Ambient Air Quality Standards for Ozone and Particulate Matter

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The EPA is announcing public hearings on the proposed revisions to the national ambient air quality standards (NAAQS) for ozone and particulate matter as well as the proposed reference method (Appendix L, 40 CFR part 50) and the proposed requirements for designation of reference and equivalent methods for monitoring PM 2.5, and ambient air quality surveillance for particulate matter that were published on December 13, 1996 (61 FR 65715, 65637, and 65779, respectively). These public hearings are the opportunity for the oral presentation of data, views, or arguments required by section 307(d)(5) of the Clean Air Act.