One of the six principal air pollutants regulated by the EPA is nitrogen dioxide.

Name: One of the six principal air pollutants regulated by the EPA is nitrogen dioxide.
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Nitrogen dioxide (NO2) is one of the six common air pollutants regulated by the U.S. Environmental Protection Agency (EPA) under the National Ambient Air Quality Standards (NAAQS), which also include particulate matter, ozone, sulfur dioxide, carbon monoxide, and lead.

One of the Six Principal Air Pollutants Regulated by the EPA