The USEPA defines stationary point sources as,"identifiable sources of air pollution at fixed locations". These sources are most commonly utilized for reporting air pollution emissions.

The emissions that are most commonly estimated are: Sulfur Dioxide, Nitrogen Oxide, Carbon Monoxide, Particulate Matter, and Volatile Organic Compounds.

The highest estimated emissions from 2006-2013 has consistently been sulfur dioxide. The second highest has been nitrogen oxide.