# NEET Questions Solved

Photochemical smog does not contain :

(1) Ozone

(2) NOx

(3) PAN

(4) Carbon monoxide

(4) Nitric oxide (NO) and nitrogen dioxide (NO2) are emitted from the combustion of fossil fuels, along with being naturally emitted from things such as volcanos and fores  fires (it is the immense concentration of these pollutants within cities that is of the most concern however, as natural emissions tend to spread out over larger areas). When exposed to ultraviolet radiation, NO2 goes through a complex series of reactions with hydrocarbons to produce the components of photochemical smog -- a mixture of ozone, nitric acid, aldehydes, peroxyacyl nitrates (PANs) and other secondary pollutants.

Difficulty Level:

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