Point, line, and area sources are idealized zero-, one-, and two-dimensional locations that are sources for various pollutants. Small stationary and non-transportation pollution sources that are not i [..]

Those sources for which a methodology is used to estimate emissions. This can include area-wide, mobile and natural sources and also groups of stationary sources (such as dry cleaners and gas stations [..]

Small sources of air pollution which by themselves may not emit very much, but when their emissions are added together they may account for a sizable portion of the total emissions of air toxics. In N [..]

Area Sources are those sources that emit less than 10 tons annually of a single hazardous air pollutant or less than 25 tons annually of a combination of hazardous air pollutants.