Discussion
Major nitrogen species responsible for nitrogen air pollution is :
Answer: B
The major species is NO\(_{2}\).
Nitrogen dioxide is the principal nitrogen oxide in polluted air. Nitric oxide from combustion is quickly oxidised to NO\(_{2}\), which is a regulated criteria pollutant, irritates the lungs, and drives the formation of ozone, smog and acid rain.
N\(_{2}\)O is a greenhouse and ozone-depleting gas but not the main local air pollutant, N\(_{2}\)O\(_{5}\) is a short-lived night-time intermediate, and HNO\(_{3}\) is a product of NO\(_{2}\) oxidation that falls out as acid deposition.
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