California Air Resources Board 2009 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	43	6%	1%
On-Road Mobile	333	49%	9%
   Gasoline Vehicles	321	48%	9%
   Diesel Vehicles	12	2%	0%
Other Mobile	230	34%	6%
   Gasoline Fuel	205	30%	5%
   Diesel Fuel	25	4%	1%
   Other Fuel	< 1	0%	0%
Natural Sources	62	9%	2%
Total	673	100%	18%
Total Statewide	3754