California Air Resources Board 2009 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	1	0%	0%
Area-wide Sources	71	17%	2%
On-Road Mobile	177	43%	5%
   Gasoline Vehicles	173	42%	5%
   Diesel Vehicles	4	1%	0%
Other Mobile	147	35%	4%
   Gasoline Fuel	85	20%	2%
   Diesel Fuel	14	3%	0%
   Other Fuel	48	12%	1%
Natural Sources	19	4%	0%
Total	415	100%	11%
Total Statewide	3754