California Air Resources Board 2007 Almanac (web)			
Chapter 5	Statewide		Table 5-7
"1,3-Butadiene"			
Emissions Source	tons/year	Percent State	
Stationary Sources	15	0%	
Area-wide Sources	358	10%	
On-Road Mobile	1209	34%	
   Gasoline Vehicles	1151	32%	
   Diesel Vehicles	58	2%	
Other Mobile	1070	30%	
   Gasoline Fuel	774	22%	
   Diesel Fuel	91	3%	
   Other Fuel	205	6%	
Natural Sources	937	26%	
Total Statewide	3589	100%