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in Environmental Chemistry by (48.5k points)
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Explain how oxides  of nitrogen are introduced  directly into the stratosphere ?

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  • Nitrogen oxides are introduced directly into the stratosphere by the supersonic jet aircraft engines in the form of exhaust gases.
  • These oxides arc released by combustion of fossil fuels and nitrogen fertilisers. Inert nitrous oxide in the stratosphere is photochemically converted into more reactive nitric oxide.
  • Oxides of nitrogen catalyses the decomposition of ozone and are themselves regenerated. Ozone gets depleted as follows:

NO + O3 \(\longrightarrow\) NO2 + O2

O2 \(\overset{hv}{\longrightarrow}\) O + O

NO2 + O \(\longrightarrow\) NO + 2O\(^{\bullet}\) .

Thus NO is regenerated in the chain reaction.

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