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American Petroleum Institute v. Environmental Protection Agency

ELR Citation: ELR 20157
Nos. 10-1079, (D.C. Cir., 07/17/2012)

The D.C. Circuit denied petitions challenging EPA's one-hour primary NAAQS for nitrogen dioxide (NOx). The new one-hour primary NAAQS requires that “the three-year average of the annual 98th percentile of the daily maximum one-hour average concentration be less than or equal to 100 parts per billion....

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