2003 Almanac (page 273)  Table 5-57  2002 Emission Inventory by Compound			

"San Diego Air Basin - 1,3-Butadiene"			
Emissions Source	tons/year	Percent Air Basin	Percent State
Stationary Sources	< 1	0%	<1%
Area-wide Sources	4	2%	<1%
On-Road Mobile	127	57%	4%
   Gasoline Vehicles	125	56%	4%
   Diesel Vehicles	2	1%	<1%
Other Mobile	85	38%	3%
Natural Sources	8	4%	0%
Total	224	100%	7%
Total Statewide	3180