EPA Staff Again Rejects CASAC Push For Tougher Daily PM NAAQS Limits

EPA staff is again rejecting the idea of tightening the daily federal limit for particulate matter (PM), opposing the advice of the agency’s clean air science advisers who support tougher daily standards to curb short-lived emissions spikes, according to the final policy assessment (PA) document supporting the reconsideration of federal limits. As EPA staff has done previously, the final PA document , released May 31, also suggests that EPA consider tightening its national ambient air quality standards (NAAQS), specifically the...