Carbon Tetrachloride			
County	Air Basin	tons/year	Percent
Contra Costa	San Francisco Bay Area	2.18	50%
Los Angeles	South Coast	1.84	42%
Orange	South Coast	0.09	2%
Santa Barbara	South Central Coast	0.07	2%
Sacramento	Sacramento Valley	0.06	1%
Ventura	South Central Coast	0.05	1%
Riverside	South Coast	0.02	1%
San Diego	San Diego	0.02	0%
Fresno	San Joaquin Valley	0.01	0%
Santa Clara	San Francisco Bay Area	0.01	0%