California Air Resources Board 2009 Almanac (web)			
Chapter 5	Statewide		Table 5-7
"1,3-Butadiene"			
Emissions Source	tons/year	Percent State	
Stationary Sources	19	1%	
Area-wide Sources	794	21%	
On-Road Mobile	993	26%	
   Gasoline Vehicles	943	25%	
   Diesel Vehicles	50	1%	
Other Mobile	1012	27%	
   Gasoline Fuel	723	19%	
   Diesel Fuel	83	2%	
   Other Fuel	206	5%	
Natural Sources	937	25%	
Total Statewide	3754	100%