One of the highly reactive gases referred to as "nitrogen oxides (NOx)" or "nitrogen oxides of nitrogen" is nitrogen dioxide (NO2). Nitric acid and nitrous acid are two further nitrogen oxides. NO2, a yellowish-brown to reddish-brown gas with a bad smell, is a significant cause of smog and acid rain.
The CAA mandates that EPA create National Ambient Air Quality Standards (NAAQS) for six common air pollutants, sometimes referred to as "criteria" air pollutants, in order to safeguard human health and welfare across the country. Particulate matter, ozone, carbon monoxide, sulfur dioxide, nitrogen dioxide, and lead are the contaminants.
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