California Air Resources Board 2004 Almanac (web) Chapter 5 South Coast Formaldehyde Emissions Table 5-28 South Coast - Formaldehyde Emissions Source tons/year Percent Air Basin Percent State Stationary Sources 688 13% 3% Area-wide Sources 177 3% 1% On-Road Mobile 2022 37% 10% Gasoline Vehicles 1350 25% 7% Diesel Vehicles 672 12% 3% Other Mobile 2515 47% 13% Natural Sources 0 0% 0% Total 5402 100% 27% Total Statewide 20087