[Update: Thank you, Howard Wein of Buchanan Ingersoll & Rooney, for pointing out our use of the wrong chemical graphic in the earlier version of this post. We long feared that flunking high school Chemistry in both regular and summer session would come back to haunt us.]  

Yesterday, in American Petroleum Institute v. EPA, the D.C. Circuit Court of Appeals affirmed EPA’s revisions to the National Ambient Air Quality Standard for nitrogen dioxide (NO2).

The revisions adopted, for the first time, an hourly NAAQS for NO2 , in addition to the
annual standard. 

Foley Hoag‘s Law and the Environment blog reports on the decision, including a stinging
slap-down of one of API’s arguments.

You can read it in Not a Good Start for Challenges to EPA NAAQS Revisions. 

Related:
EPA final rule on Air Quality Standards for Oxides of Nitrogen and Sulfur
EPA Fact Sheet

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