2009 CO Air Quality Table "Table 2-19, Page 2-41" AIR BASIN 2007 Maximum Peak 8-Hour Indicator in parts per million Number of Days in 2007 above 8-Hour Standard State National Great Basin Valleys No Data No Data No Data Lake County No Data No Data No Data Lake Tahoe No Data No Data No Data Mojave Desert 1.6 0 0 Mountain Counties 0.5 0 0 North Central Coast 1.0 0 0 North Coast 1.6 0 0 Northeast Plateau No Data No Data No Data Sacramento Valley 4.2 0 0 Salton Sea 7.3 0 0 San Diego 4.3 0 0 San Francisco Bay Area 3.4 0 0 San Joaquin Valley 3.4 0 0 South Central Coast 1.7 0 0 South Coast 6.0 0 0