KAREN LECRAFT HENDERSON, Circuit Judge:
In January 2012, the United States Environmental Protection Agency (EPA) promulgated an interim final rule (IFR) authorizing EPA to issue certificates of conformity to diesel truck engine manufacturers for 2012 and 2013 model-year engines notwithstanding the engines did not conform to EPA's emission standard for nitrogen oxides (NOx), promulgated under section 202(a) of the Clean Air Act (CAA), 42 U.S.C. § 7521(a) —...
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