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Question
Photochemical smog is mainly composed of ______.
Options
CO2
PAN and NOx
SO2
ozone, PAN and NOx
MCQ
Fill in the Blanks
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Solution
Photochemical smog is mainly composed of ozone, PAN and NOx.
Explanation:
Photochemical smog contains secondary pollutants such as ozone, PAN and nitrogen oxides. Carbon dioxide and sulphur dioxide are not its principal components, and the option listing only PAN and NOx omits ozone.
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