California Air Resources Board 2009 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	122	28%	3%
On-Road Mobile	85	19%	2%
   Gasoline Vehicles	80	18%	2%
   Diesel Vehicles	5	1%	0%
Other Mobile	87	20%	2%
   Gasoline Fuel	62	14%	2%
   Diesel Fuel	7	2%	0%
   Other Fuel	17	4%	0%
Natural Sources	143	33%	4%
Total	437	100%	12%
Total Statewide	3754