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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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Hint. Lichens act as bioindicatore of air pollution and are pollution and pollutio and sensitive to `SO_(2))`. Delhi has maximum number of vechicles. Vehicular exhaust exhaust has incresed concentrations of `SO_(2))` and it kills lichens. In Darjeeling and Manali, vehicular pollution is less.
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