Nitrogen oxides are byproducts of combustion engines, primarily from vehicles, and contribute to smog and acid rain.
Nitrogen oxides (NOx) are produced when atmospheric nitrogen and oxygen react at high temperatures created by combustion engines, primarily from vehicle engines, electrical utility, and industrial combustion. The main component, nitrogen dioxide (NO2), contributes to smog and acid rain, and can lead to lung damage, aggravate asthma, and form nitric acid that causes acid rain.
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