Chapter 5 Statewide Table 5-15 Formaldehyde County Air Basin tons/year Percent Los Angeles South Coast 3098 15% San Diego San Diego 1324 7% Kern San Joaquin Valley 1210 6% Orange South Coast 1020 5% Santa Clara San Francisco Bay Area 709 4% Alameda San Francisco Bay Area 636 3% Riverside South Coast 599 3% Fresno San Joaquin Valley 590 3% San Bernardino South Coast 564 3% Sacramento Sacramento Valley 541 3%