What are the sources of air pollution?

air quality, air pollution, sources, stationary, mobile, wildfires, emissions, power plants, automobiles, sulfur dioxide, nitrogen oxides, particulate matter, ozone, volatile organic compounds, toxics, nitrogen, sulfur, heavy metals, transport. read more

Mobile sources account for more than half of all the air pollution in the United States and the primary mobile source of air pollution is the automobile, according to the Environmental Protection Agency. read more

"Area" sources consist of smaller-size facilities that release lesser quantities of toxic pollutants into the air. Area sources are defined as sources that emit less than 10 tons per year of a single air toxic, or less than 25 tons per year of a combination of air toxics. read more

No matter the source, there are two ways pollution can enter the air. Point source pollution is when the air pollutants come from a single source of origin, such as smokestacks at a single factory. Non-point source pollution is when the air pollutants come from many sources, such as all of the cars in the U.S. read more