What is air quality modeling and when is it needed?
Air quality modeling is a method of analyzing air quality impacts from pollution sources and is usually done by means of a computer. For criteria air pollutants such as SO2, NOx, particulate matter and CO, a modeling analysis is required if it has been determined that a permit is necessary for the particular device. For Title V sources, this only applies when a new device or modification is involved. In the case of toxic air pollutants, modeling is normally required, even if no permit is issued.
