Staff Float Options For EPA To Retain, Tighten Secondary NAAQS Limits

EPA staff is advising the agency that it could plausibly retain its existing “secondary,” or welfare-based national ambient air quality standards (NAAQS) for nitrogen oxides (NOx), sulfur oxides (SOx) and particulate matter (PM), but is also offering options for tougher limits, in a draft paper now under consideration by agency science advisers. The options are spelled out in a draft policy assessment (PA), set for release to the public and the advisors June 1, according to a May 31 virtual...