Diesel Particulate Matter			
County	Air Basin	tons/year	Percent
Los Angeles	South Coast	4639	19%
San Diego	San Diego	1748	7%
Orange	South Coast	1763	7%
Fresno	San Joaquin Valley	1071	4%
Alameda	San Francisco Bay Area	947	4%
Riverside	South Coast	865	3%
Santa Clara	San Francisco Bay Area	873	4%
Kern	San Joaquin Valley	693	3%
Sacramento	Sacramento Valley	793	3%
San Bernardino	South Coast	757	3%