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Area Designations for 1997 Fine Particle (PM2.5) Standards


Information provided for informational purposes only Note: EPA no longer updates this information, but it may be useful for historical purposes. See the PM Designations Home Page for more recent information about PM Designations.

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, 2004

Description 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

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