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Why do not lichens occur in Delhi wherea...

Why do not lichens occur in Delhi whereas they commonly grown in Manali or Darjeeling?

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Lichens are bioindicators of air pollution. They are highly sensitive to sulphur dioxide `(SO_(2))` pollution in air from automobiles and other factories. Delhi has maximum air pollution due to a large number of vehicles compared to Manali and Darjeeling. Therefore, the growth of lichens does not occur in Delhi or any place, where air pollution is high.
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