Sacramento Valley Air Basin	
	Yuba City-Almond Street

Salton Sea Air Basin	
	Calexico-East
	Calexico-Ethel Street
	Calexico-Grant Street
	Indio-Jackson Street
	Westmorland-W 1st Street

San Diego Air Basin	
	Otay Mesa-Paseo International
	San Diego-Logan Avenue
	El Cajon-Redwood Avenue
	San Diego-12th Avenue

San Joaquin Valley Air Basin	
	Bakersfield-Golden State Highway
	Visalia-N Church Street
	Fresno-Drummond Street
	Hanford-S Irwin Street
	Corcoran-Patterson Avenue

South Coast Air Basin	
	Riverside-Rubidoux
	Ontario-1408 Francis Street
	Fontana-Arrow Highway
	Azusa
	San Bernardino-4th Street



"Sites with annual geometric mean PM10 concentrations violating the State PM10 standard during 1999. The top five sites in each air basin are listed in descending order of their maximum annual concentration. If an air basin is not listed, annual PM10 concentrations in that air basin were not above the State annual PM10 standard. "