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What is smog ? Give its harmful effects....

What is smog ? Give its harmful effects.

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Smog is a dark fog formed by condensation of water, dust and smoke particles, and various gaseous pollutants (Oxides of nitrogen, sulphur dioxide, hydrogen sulphide etc.) in the troposphere. Somg causes (i) toxic effects on man, animals and plants, (ii) respiratory problems in human beings, (iii) it also reduces visibility leading to accidents.
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