EPA Region 9
http://www.epa.gov/region9/

South Coast Air Quality Management District
http://www.aqmd.gov/

Southern California Association of Governments
http://www.scag.ca.gov/

California Air Resources Board
http://www.arb.ca.gov/homepage.htm

California Council for Environmental and Economic Balance
http://www.cceeb.org/

City of Los Angeles Environmental Affairs Department
http://www.cityofla.org/EAD/index.htm