EPA has finally proposed revisions to the national ambient air quality standard for PM2.5. The Administrator is proposing to lower the standard from 12.0 ug/m3 to a range of 9.0 to 10.0 ug/m3.
Readers of this space will recall that the Clean Air Science Advisory Committee recommended that EPA lower the PM2.5 NAAQS to between 8.0 and 10.0 ug/m3. Environmentalists aren’t going to be happy with any standard above 8.0 ug/m3 and it’s likely that conservatives aren’t going to be happy with any decrease from the current standard.… More