Photochemical smog formed in congested metropolitan cities mainly consists of:
Correct answer: A. Ozone, peroxyacetyl nitrate and No2
- A. Ozone, peroxyacetyl nitrate and No2
- B. Smoke, peroxyacetyl nitrate and SO2
- C. Hydrocarbons, SO2 and CO2
- D. Hydrocarbons, ozone and SO2
Explanation
Photochemical smog is produced when nitrogen oxides and hydrocarbons react in sunlight, forming ozone and peroxyacetyl nitrate. Ozone, PAN and nitrogen dioxide are therefore its characteristic components, whereas sulphur dioxide belongs mainly to industrial or classical smog.
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