ELR Citation: 43 ELR 20019
No(s). 10-1413 (D.C. Cir. Jan 22, 2013)

The D.C. Circuit vacated and remanded portions of an EPA rule establishing regulations for particulate matter less than 2.5 micrometers (PM2.5) under CAA §166. The rule established significant impact levels (SILs) and a significant monitoring concentration (SMC) for PM2.5, screening tools EPA uses ...