"2003 Almanac (page 217)  Table 5-7  2002 Top Ten Counties:  1,3-Butadiene"			

"1,3-Butadiene"			
County	Air Basin	tons/year	Percent
Los Angeles	South Coast	509	16%
San Diego	San Diego	224	7%
Orange	South Coast	159	5%
Tulare	San Joaquin Valley	109	3%
Santa Clara	San Francisco Bay Area	107	3%
San Bernardino	South Coast	97	3%
Alameda	San Francisco Bay Area	90	3%
Kern	San Joaquin Valley	90	3%
Riverside	South Coast	87	3%
Fresno	San Joaquin Valley	84	3%