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secondary NAAQS

Center for Biological Diversity v. Environmental Protection Agency

ELR Case

The D.C. Circuit upheld EPA’s decision to defer adopting new secondary NAAQS for oxides of sulfur (SOx) and nitrogen (NOx) pending further scientific study. Citing doubts about the accuracy of its aquatic acidification index model—used...

Mississippi v. Environmental Protection Agency

ELR Case

The D.C. Circuit remanded for reconsideration EPA's revisions to the secondary, welfare-based NAAQS for ozone, but denied petitions challenging revisions to the primary, health-based ozone NAAQS. Primary standards set limits to protect...