California Air Resources Board 2009 Almanac (web) Chapter 5 San Joaquin Valley Table 5-46 San Joaquin Valley - Benzene Emissions Source tons/year Percent Air Basin Percent State Stationary Sources 543 32% 5% Area-wide Sources 13 1% 0% On-Road Mobile 633 38% 6% Gasoline Vehicles 481 29% 4% Diesel Vehicles 152 9% 1% Other Mobile 490 29% 5% Gasoline Fuel 279 17% 3% Diesel Fuel 143 9% 1% Other Fuel 67 4% 1% Natural Sources < 1 0% 0% Total 1680 100% 16% Total Statewide 10794