California Air Resources Board 2006 Almanac (web)			
Chapter 5	San Francisco Bay Area		Table 5-35
"San Francisco Bay Area - 1,3-Butadiene"			
Emissions Source	tons/year	Percent Air Basin	Percent State
Stationary Sources	1	0%	0%
Area-wide Sources	2	1%	0%
On-Road Mobile	250	60%	9%
   Gasoline Vehicles	245	59%	9%
   Diesel Vehicles	5	1%	0%
Other Mobile	161	39%	6%
   Gasoline Fuel	103	25%	4%
   Diesel Fuel	11	3%	0%
   Other Fuel	47	11%	2%
Natural Sources	0	0%	0%
Total	414	100%	15%
Total Statewide	2778