1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, and 2014. United States Geological Survey and Environmental Systems Research Institute (Redlands, Calif.). This point shapefile contains the proper names and locations of hospitals in the United States and its Territories using the Federal standard for g... Environmental Systems Research Institute (Redlands, Calif.).
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2008. 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 lead (Pb) 3... United States. Bureau of Transportation Statistics.
2008. 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 ozone (O3) ... United States. Bureau of Transportation Statistics.
2008, 2009, 2010, and 2011. 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.
2008, 2009, 2010, and 2011. 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.