2002 Almanac (page 245) Table 5-19 2001 Top Ten Counties: Perchloroethylene Perchloroethylene County Air Basin tons/year Percent Los Angeles South Coast 3088 26% San Diego San Diego 1668 14% Orange South Coast 1537 13% Alameda San Francisco Bay Area 467 4% Sacramento Sacramento Valley 461 4% Santa Clara San Francisco Bay Area 422 4% San Bernardino South Coast 399 3% San Francisco San Francisco Bay Area 284 2% Riverside South Coast 274 2% San Mateo San Francisco Bay Area 258 2%