ELR Citation: 42 ELR 20157
No(s). 10-1079 (D.C. Cir. Jul 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 billi...