 
Nitrogen Dioxide - NO2
Nitrogen dioxide is a brown noxious gas leftover from burning fossil fuels. On sunny days, it mixes with volatile organic compounds to make ozone, a major ingredient of smog.
Source
Cars and trucks produce over 3/4ths of it. Oil refineries, power plants and industry produce the rest.
How It Hurts
Nitrogen dioxide irritates our lungs and causes bronchitis and other diseases. Nitrogen oxides also cause acid rain and snow.
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At a Glance 
