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Policy/Guidance
Area Designations for the Revised 24-Hour Fine Particle National Ambient Air Quality Standard (PDF) (5 pp, 321KB) June 8, 2007You will need Adobe Reader to view some of the files on this page. See EPA's PDF page to learn more.
Additional Guidance On Defining Area Boundaries for PM-2.5 Designations (PDF) (2 pp, 44KB) February, 13, 2004Description of the PM2.5 guidance and designations process (PDF) (4 pp, 17KB) April 1, 2003
Guidance for determining boundaries of PM2.5 attainment and nonattainment areas (PDF) (13 pp, 34KB) April 1, 2003
Clean Data Policy for the Fine Particle National Ambient Air Quality Standards (PDF) (6 pp, 292KB) December 14, 2004
Impelementation of New Source Review Requirments in PM-2.5 Nonattainment Areas (PDF) (7 pp, 93KB) April 6, 2005