California Air Resources Board 2008 Almanac (web)			
Chapter 5	San Francisco Bay Area		Table 5-36
"San Francisco Bay Area - 1,3-Butadiene"			
Emissions Source	tons/year	Percent Air Basin	Percent State
Stationary Sources	2	0%	0%
Area-wide Sources	2	1%	0%
On-Road Mobile	211	53%	6%
   Gasoline Vehicles	206	52%	6%
   Diesel Vehicles	5	1%	0%
Other Mobile	161	41%	4%
   Gasoline Fuel	96	24%	3%
   Diesel Fuel	16	4%	0%
   Other Fuel	49	12%	1%
Natural Sources	19	5%	1%
Total	394	100%	11%
Total Statewide	3589