Image: US Counties Designated Non-attainment according to EPA NAAQS
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Description: US Counties Designated Non-attainment according to Environmental Protection Agency's National Ambient Air Quality Standards. Image updated 10/01/2015.
Title: US Counties Designated Non-attainment according to EPA NAAQS
Credit: http://www3.epa.gov/airquality/greenbook/mapnpoll.html
Author: United States EPA
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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