California Air Resources Board 2006 Almanac (web)			
Chapter 5	San Diego		Table 5-57
"San Diego - 1,3-Butadiene"			
Emissions Source	tons/year	Percent Air Basin	Percent State
Stationary Sources	1	1%	0%
Area-wide Sources	2	1%	0%
On-Road Mobile	99	52%	4%
   Gasoline Vehicles	97	51%	3%
   Diesel Vehicles	2	1%	0%
Other Mobile	88	46%	3%
   Gasoline Fuel	60	31%	2%
   Diesel Fuel	4	2%	0%
   Other Fuel	25	13%	1%
Natural Sources	0	0%	0%
Total	190	100%	7%
Total Statewide	2778