ELR Citation: 47 ELR 20132
No(s). 16-1097 (D.C. Cir. Oct 24, 2017)

The D.C. Circuit held that EPA did not violate the CAA by modifying, without notice and comment, its prior understandings of how to measure a proposed transportation project’s impact on ambient levels of particulate matter. In 2006, EPA revised “hot spot" regulations for fine particulate matter....