California Air Resources Board 2004 Almanac (web)				Table 5-57
Chapter 5	"San Diego 1,3-Butadiene Emissions"			
"San Diego - 1,3-Butadiene"				
Emissions Source	tons/year	Percent Air Basin	Percent State	
Stationary Sources	< 1	0%	0%	
Area-wide Sources	4	2%	0%	
On-Road Mobile	116	51%	4%	
   Gasoline Vehicles	114	50%	4%	
   Diesel Vehicles	2	1%	0%	
Other Mobile	100	44%	3%	
Natural Sources	8	4%	0%	
Total	229	100%	7%	
Total Statewide	3228