Nitric oxide occurs in the tropospheric nitrogen cycle, but it destroys ozone in the stratosphere. The equation for its reaction with ozone is :
NO + O3 → NO2 + O2
The equation of reverse reaction is:
NO2 + O2 → NO + O3
When Nitrogen oxide reaches the stratosphere, it breaks down to form nitrogen oxides. These reactions causes ozone-depletion. This gas has become the largest ozone destroying factor.
Nitrogen oxide is produced due to fertilizers and at sewage treatment plants. In 1980s, Man-made CFCs started to make holes on the ozone but it was banned due to the treaty of Montreal Protocol. Regular Emission of NO can cause worse situation than CFCs.
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