Dinitrogen is a robust compound, but reacts at hig altitude to form oxides. The oxide of nitrogen the can damage plant leaves and retard photosynthes is

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Dinitrogen and dioxygen are the main constituents of air. These gases do not react with each other at a normal temperature. At high altitudes when lightning strikes, they combine to form oxides of nitrogen.
$N_{2} (g) + O_{2} (g) \to 2 NO (g)$
NO reacts instantly with oxygen to give NO₂
$2 NO (g) + O_{2} (g) \to 2 {NO}_{2} (g)$
Rate of production of NO₂ is faster when nitric oxide reacts with ozone in the stratosphere
The irritant red haze in the traffic and congested places is due to oxides of nitrogen. Higher concentrations of NO₂ damage the leaves of plants and retard the rate of photosynthesis. It is toxic to living tissues also

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