EPA Floats New Air Modeling Guidance, With Focus On Cumulative Impacts

EPA is proposing an update to its technical guidelines on modeling air pollution, with a new emphasis on estimating the cumulative impact of multiple pollution sources on local populations, in an action that has implications for how air regulators determine attainment of potentially tougher federal air quality limits, and how they write air permits. In an Oct. 23 proposed rule , EPA announces the intended update to its Guideline on Air Quality Models, including changes to its American Meteorological Society...