NATURAL RESOURCES DEFENSE COUNCIL and Sierra Club, Petitioners
v.
ENVIRONMENTAL PROTECTION AGENCY, Respondent
Fine Particulate Litigation Group et al., Intervenors.
United States Court of Appeals, District of Columbia Circuit.https://leagle.com/images/logo.png
Opinion for the Court filed by Circuit Judge HENDERSON.
United States Court of Appeals, District of Columbia Circuit.
KAREN LeCRAFT HENDERSON, Circuit Judge:
The four petitioners1 seek review of two final rules, promulgated pursuant to the Clean Air Act (CAA, Act), which govern implementation of the national ambient air quality standard (NAAQS) for "fine" particulate matter — that is, particulate matter (PM)2 having a diameter equal to or less than 2.5 micrometers (PM2.5). See Final Clean...
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