California Air Resources Board 2008 Almanac (web)			
Chapter 5	Sacramento Valley		Table 5-69
"Sacramento Valley - 1,3-Butadiene"			
Emissions Source	tons/year	Percent Air Basin	Percent State
Stationary Sources	< 1	0%	0%
Area-wide Sources	42	11%	1%
On-Road Mobile	98	26%	3%
   Gasoline Vehicles	93	25%	3%
   Diesel Vehicles	5	1%	0%
Other Mobile	92	24%	3%
   Gasoline Fuel	67	18%	2%
   Diesel Fuel	8	2%	0%
   Other Fuel	16	4%	0%
Natural Sources	143	38%	4%
Total	376	100%	10%
Total Statewide	3589