California Air Resources Board 2007 Almanac (web)			
Chapter 5	San Joaquin Valley		Table 5-47
"San Joaquin Valley - 1,3-Butadiene"			
Emissions Source	tons/year	Percent Air Basin	Percent State
Stationary Sources	2	<1%	<1%
Area-wide Sources	96	19%	3%
On-Road Mobile	140	28%	4%
   Gasoline Vehicles	124	25%	3%
   Diesel Vehicles	16	3%	<1%
Other Mobile	134	27%	4%
   Gasoline Fuel	70	14%	2%
   Diesel Fuel	15	3%	<1%
   Other Fuel	49	10%	1%
Natural Sources	131	26%	4%
Total	503	100%	14%
Total Statewide	3589