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Lung diseases are four times more in urban areas than in rural areas. This is due to the presence of

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$S O_{2}$

$C O_{2}$

$N_{2}$

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answer is A.

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$S O_{2}$ is a chief atmospheric air pollutant and its presence in a higher quantity in the air in urban areas than in rural areas. The presence of $S O_{2}$ gas in the atmosphere causes lung diseases in living beings.

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