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1. Particulate Matter (PM-10): Federal Non-Attainment Area Designations, U.S. Region 9, 2013

2013. United States. Environmental Protection Agency. Region IX. This polygon shapefile contains nonattainment areas for particulate matter < 10 microns. Nonattainment areas are geographic areas which have not... United States. Environmental Protection Agency. Region IX.

2. Annual Particulate Matter (Annual PM-2.5) Non-Attainment Designations in Region 9, 2011

2011. United States. Environmental Protection Agency, Region IX. This polygon shapefile contains designated areas for particulate matter < 2.5 microns, according to the annual National Ambient Air Quality Stan... United States. Environmental Protection Agency, Region IX.

3. Lead (Pb): Federal Area Designations: California, 2011

2011. United States. Environmental Protection Agency. This polygon shapefile contains area designations of lead attainment (Pb) in California (Region 9). There are three categories of designations: : n... United States. Environmental Protection Agency. Region IX.

4. Particulate Matter (PM-10): Federal Area Designations: California, 2011

2011. United States. Environmental Protection Agency. Region IX. This polygon shapefile shows designated areas for particulate matter < 10 microns according to the 24-Hour National Ambient Air Quality Standard... California. Air Resources Board.

5. Particulate Matter (PM-2.5) Non-Attainment Areas: California, 2011

2011. United States. Environmental Protection Agency. . This polygon shapefile identifies areas in the U.S. where air pollution levels have not met the 2006 National Ambient Air Quality Standards (NAAQS)... California. Air Resources Board.

6. Visibility Reducing Particles: California State Area Designations, 2008-2011

2011. Stephen P. Teale Data Center (Calif.). and California. Air Resources Board. Planning and Technical Support Division. This polygon shapefile shows area designations in California as required under Health and Safety Code section 39608 for ozone, nitrogen dioxide, su... California. Air Resources Board.

7. Nonattainment Areas for Sulfur Dioxide Pollution, United States and Territories, 2010

2010. United States. Bureau of Transportation Statistics and Stackhouse, Cecil. This polygon shapefile depicts nonattainment and maintenance areas for the United States and its Territories for the enforcement of the sulfur diox... United States. Bureau of Transportation Statistics.

8. Precipitation in Watersheds: San Francisco Bay Area, California, 2009

2009. Bay Area Open Space Council, Conservation Lands Network, San Francisco Bay Area Upland Habitat Goals Project, and GreenInfo Network (Firm). This polygon shapefile depicts a watershed integrity cluster analysis at the CalWater 2.2.1 Planning Watershed (PWS) level performed by mapping fac... Bay Area Open Space Council.

9. Carbon Monoxide: California State Area Designations, 2008-2011

2008. California. Air Resources Board. Planning and Technical Support Division and United States. Environmental Protection Agency. This polygon shapefile contains area designations of carbon monoxide (CO) levels in California as required under Health and Safety Code section 396... California. Air Resources Board.

10. Hydrogen Sulfide: California State Area Designations, 2008-2011

2008. Stephen P. Teale Data Center (Calif.). and California. Air Resources Board. Planning and Technical Support Division. This polygon shapefile contains area designations of hydrogen sulfide levels in California as required under Health and Safety Code section 39608. ... California. Air Resources Board.