California Air Resources Board 2004 Almanac (web) Table 5-17 Chapter 5 Top Ten Counties - Methylene Chloride Emissions Methylene Chloride County Air Basin tons/year Percent Los Angeles South Coast 2618 35% Orange South Coast 1061 14% San Bernardino South Coast 473 6% San Diego San Diego 381 5% Santa Clara San Francisco Bay Area 323 4% Riverside South Coast 260 3% Alameda San Francisco Bay Area 260 3% Sacramento Sacramento Valley 175 2% Ventura South Central Coast 160 2% Contra Costa San Francisco Bay Area 132 2%