The U.S. EPA designates areas as in non-attainment with National Ambient Air Quality Standards (NAAQS) if ambient air concentrations of certain pollutants exceed standard levels. Stationary sources located in these areas are required to significantly reduce emissions through technological and...

The Clean Air Act's National Ambient Air Quality Standards (NAAQS) set limits on ambient air concentrations of hazardous pollutants. Since its creation, NAAQS guidelines have evolved to curb ambient concentrations of Particulate Matter less than 2.5 ug in diameter (PM2.5), which have been linked...

Concentrated Animal Feeding Operations (CAFOs) – animal feeding operations with over 1,000 animal units in confined spaces – have proliferated over the past 30 years in the United States. CAFOs provide operational cost savings, but higher animal concentrations in confined spaces can generate...

The Clean Air Act's National Ambient Air Quality Standards (NAAQS) and New Source Review (NSR) permitting work in conjunction to improve ambient air quality in the United States. However, all previous studies of the NAAQS ignore this joint nature and focus solely on the effects of NAAQS...