School buses and cars in traffic with exhaust visibly escaping their vehicles

  • Vehicle exhaust4 by MPCA Photos. Used via Attribution-NonCommercial (CC BY-NC 2.0), via Flickr.

    • Hazard

    Air Quality

    Air quality reflects the abundance of pollution present in air. Pollution is a mix of hazardous substances from both human-made and natural sources. Primary sources of human-made air pollution include vehicle emissions, fuel oils and natural gas to heat homes, by-products of manufacturing and power generation—particularly coal-fueled power plants—and fumes from chemical production.

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