"1,3-Butadiene"			
County	Air Basin	tons/year	Percent
Los Angeles	South Coast	1032	19%
San Diego	San Diego	400	7%
Orange	South Coast	327	6%
San Bernardino	South Coast	180	3%
Tulare	San Joaquin Valley	155	3%
Sacramento	Sacramento Valley	153	3%
Santa Clara	San Francisco Bay Area	150	3%
Alameda	San Francisco Bay Area	141	3%
Fresno	San Joaquin Valley	136	3%
Riverside	South Coast	129	2%