California Air Resources Board 2009 Almanac (web)			
Chapter 5	Table 5-22		Statewide
Diesel PM			
County	Air Basin	tons/year	Percent
Los Angeles	South Coast	5163	14%
Kern	San Joaquin Valley	1640	5%
San Diego	San Diego	1607	4%
San Bernardino	Mojave Desert	1450	4%
Orange	South Coast	1394	4%
Fresno	San Joaquin Valley	1159	3%
Alameda	San Francisco Bay Area	1033	3%
San Joaquin	San Joaquin Valley	993	3%
San Bernardino	South Coast	887	2%
Riverside	South Coast	856	2%