2003 Almanac (page 257)  Table 5-35  2002 Emission Inventory by Compound			

"San Francisco Bay Area Air Basin - 1,3-Butadiene"			
Emissions Source	tons/year	Percent Air Basin	Percent State
Stationary Sources	4	1%	0%
Area-wide Sources	2	0%	0%
On-Road Mobile	306	61%	10%
   Gasoline Vehicles	301	60%	9%
   Diesel Vehicles	5	1%	0%
Other Mobile	191	38%	6%
Natural Sources	1	0%	0%
Total	504	100%	16%
Total Statewide	3180