Implementation of the 1997 and 2006 Particulate Matter (PM2.5) National Ambient Air Quality Standards (NAAQS)
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Rule Summary
On January 4, 2013, in Natural Resources Defense Council (NRDC) v. EPA, the D.C. Circuit Court remanded to the Environmental Protection Agency (EPA) the ‘‘Final Clean Air Fine Particle Implementation Rule’’ and the ‘‘Implementation of the New Source Review (NSR) Program for Particulate Matter Less than 2.5 Micrometers (PM2.5)’’ final rule. The Court found that the EPA erred in implementing the 1997 PM 2.5 National Ambient Air Quality Standards (NAAQS) pursuant solely to the general implementation provisions of subpart 1 of Part D of Title I of the Clean Air Act (CAA or Act), without also considering the particulate matter-specific provisions of subpart 4 of Part D. The Court’s ruling remanded the rules to the EPA to address implementation of the 1997 PM2.5 NAAQS under subpart 4.
Rule History
12/24/2014 - Final Rule; Correcting Amendment
10/28/2014 - Correcting Amendments
10/03/2014 - Correcting Amendments
06/02/2014 - Final Rule
11/21/2013 - Proposed Rule
01/04/2013 - DC Circuit Court Decision on Natural Resources Defense Council (NRDC) v. EPA
Additional Resources
Natural Resources Defense Council (NRDC) v. EPA Fact Sheet
Related Rules
2006 National Ambient Air Quality Standards (NAAQS) for Particulate Matter (PM2.5)