A depressing top ten list

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Planet Hazard produces Google Maps with major polluters. This allows you to look up your own location if you are in the US, by county, state, etc., and to access the data in various ways.

Learn about the unknown hazards around you – the toxins you may be breathing. PlanetHazard uses information from the EPA to map over 86,000 companies throughout the United States that emit hazardous air pollutants.