California Air Resources Board 2004 Almanac (web)				
Chapter 5	"San Francisco Bay Area 1,3-Butadiene Emissions"			Table 5-35
"San Francisco Bay Area - 1,3-Butadiene"				
Emissions Source	tons/year	Percent Air Basin	Percent State	
Stationary Sources	6	1%	0%	
Area-wide Sources	2	0%	0%	
On-Road Mobile	288	59%	9%	
   Gasoline Vehicles	283	58%	9%	
   Diesel Vehicles	5	1%	0%	
Other Mobile	191	39%	6%	
Natural Sources	1	0%	0%	
Total	488	100%	15%	
Total Statewide	3228