8 datasets found
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Federal
County Political Boundaries (National)
Department of Transportation —
County boundaries with political limit - boundaries extending into the ocean (NTAD). The TIGER/Line shapefiles and related database files (.dbf) are an extract of... -
Federal
Nonattainment Area - Lead (Pb - 2008)
Department of Transportation —
Non-attainment and maintenance areas for the United States and its territories (NTAD). The standard for the Lead NAA is 0.15 micrograms per cubed meter. For more... -
Federal
County Boundaries with Shorelines (National)
Department of Transportation —
County boundaries with shorelines cut in (NTAD). The TIGER/Line Files are shapefiles and related database files (.dbf) that are an extract of selected geographic and... -
Federal
Nonattainment Area - Particulate Matter - 2.5 24 hr (2006)
Department of Transportation —
Non-attainment and maintenance areas for the United States and its territories (NTAD). For more detailed information on this dataset, see the Overview Description in... -
Federal
Nonattainment Area - Particulate Matter - 2.5 Annual (1997)
Department of Transportation —
Non-attainment and maintenance areas for the United States and its territories (NTAD). For more detailed information on this dataset, see the Overview Description in... -
Federal
Nonattainment Area - Sulfur Dioxide (SO2 - 2010)
Department of Transportation —
Non-attainment and maintenance areas for the United States and its territories (NTAD). For more detailed information on this dataset, see the Overview Description in... -
Federal
Nonattainment Area - Particulate Matter - 10 (1990)
Department of Transportation —
Non-attainment and maintenance areas for the United States and its territories (NTAD). For more detailed information on this dataset, see the Overview Description in... -
Federal
Nonattainment Area - Sulfur Dioxide (SO2 - 1978)
Department of Transportation —
Non-attainment and maintenance areas for the United States and its territories (NTAD). For more detailed information on this dataset, see the Overview Description in...
8 datasets found