These pages are intended to provide overviews on regulatory concerns and requirements for specific source categories. They are not intended to provide a complete, detailed review for each category. Those seeking more specific information are encouraged to contact the AQCD Permits & Engineering Section.
The Clean Air Act, which was last amended in 1990, requires EPA to set National Ambient Air Quality Standards for pollutants considered harmful to public health and the environment. The Clean Air Act established two types of national air quality standards. Primary standards set limits to protect public health, including the health of "sensitive" populations such as asthmatics, children, and the elderly.
