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PM2.5 Designations for the 1997 Air Quality Standards

This is an unofficial list of tribes in PM2.5 nonattainment areas as of April 5, 2005. Official nonattainment boundaries are specified in 40 CFR Part 81. This document in no way establishes tribal territories.

Map showing rough locations of tribes in nonattainment areas across the United States

Tribes in PM2.5 Nonattainment Areas

Tribal Recommendations and EPA Responses


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