California Air Resources Board 2004 Almanac (web)				
Chapter 5	"South Coast 1,.3-Butadiene Emissions"			Table 5-24
"South Coast - 1,3-Butadiene"				
Emissions Source	tons/year	Percent Air Basin	Percent State	
Stationary Sources	7	1%	0%	
Area-wide Sources	39	4%	1%	
On-Road Mobile	512	58%	16%	
   Gasoline Vehicles	503	57%	16%	
   Diesel Vehicles	9	1%	0%	
Other Mobile	304	35%	9%	
Natural Sources	17	2%	1%	
Total	880	100%	27%	
Total Statewide	3228