Area Designations for 1997 Fine Particle (PM2.5) Standards
Policy/Guidance
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Area Designations for the Revised 24-Hour Fine Particle National Ambient Air Quality Standard (PDF) (5 pp, 321KB) June 8, 2007
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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