Particle Pollution Designations

EPA Guidance on the Area Designations for the 2012 Particle Pollution NAAQS

States and Tribes should refer to the following guidance for area designations for the 2012 Particle Pollution NAAQS when preparing their recommendations on area designations.

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April 2013 Guidance for Area Designations for the 2012 Annual PM2.5 NAAQS (PDF)(34 pp, 12 MB)