California Air Resources Board 2008 Almanac (web)			
Chapter 5	South Coast		Table 5-25
"South Coast - 1,3-Butadiene"			
Emissions Source	tons/year	Percent Air Basin	Percent State
Stationary Sources	5	1%	0%
Area-wide Sources	20	3%	1%
On-Road Mobile	428	56%	12%
   Gasoline Vehicles	414	54%	12%
   Diesel Vehicles	14	2%	0%
Other Mobile	251	33%	7%
   Gasoline Fuel	224	29%	6%
   Diesel Fuel	27	4%	1%
   Other Fuel	< 1	0%	0%
Natural Sources	62	8%	2%
Total	766	100%	21%
Total Statewide	3589