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Oxides Of Nitrogen (NOx)

Nitric oxide (NO)
NO is a colourless, odourless, and non-flammable toxic gas. It is a by-product of combustion in air, as in automobile engines or fossil fuel power plants, and is produced naturally during the electrical discharges of lightning in thunderstorms. As a free radical it is very reactive and easily oxidized to nitrogen dioxide by oxygen.


Nitrogen dioxide (NO2)

NO2 is a reddish-brown, oxidizing, toxic gas with a pungent smell. It readily reacts with water to give nitric acid and nitrous acid:

 

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