EPA Poised To Propose Tougher Limits For Fine Particulate Matter

EPA is on the cusp of proposing a new rule that will likely tighten national ambient air quality standards (NAAQS) for fine particulate matter (PM2.5), sources say, a measure that will float tougher annual and possibly daily limits for the pollutant which are expected to drive tougher regulatory standards in many parts of the country. The proposal, which is expected to be signed within days, will likely strengthen at least the annual health-based “primary” limit for PM2.5 from a level...