CASAC Urges EPA To Tighten Secondary NOx-SOx Limits, Criticizes Methods

A majority of EPA’s Clean Air Scientific Advisory Committee (CASAC) are planning to urge the agency to toughen “secondary” standards for nitrogen oxides (NOx), sulfur oxides (SOx) and fine particulate matter (PM2.5) by more than EPA staff has recommended but are also planning to call for a second draft of staff advice, possibly delaying the review. At the conclusion of a two-day virtual meeting Sept. 6, all but one of the seven-member chartered CASAC called for EPA to tighten the...