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Shapefile
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Air quality
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Puerto Rico
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United States
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1990
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1. Nonattainment Areas for Carbon Monoxide Pollution: United States and Territories, 1990
1990. 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 carbon mono... United States. Bureau of Transportation Statistics.
2. Nonattainment Areas for Nitrogen Dioxide Pollution: United States and Territories, 1990
1990. 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 nitrogen di... United States. Bureau of Transportation Statistics.