Why do not lichens occur in Delhi whereas the | vedclass

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Question

(B) Lichens are known as bio-indicators of air pollution,specifically sensitive to sulfur dioxide $(SO_2)$.Delhi has a very high density of automobile

Vedclass · Accepted Answer

Lichens are sensitive to $SO_2$ pollution

Vedclass · Answer

(B) Lichens are known as bio-indicators of air pollution,specifically sensitive to sulfur dioxide $(SO_2)$.Delhi has a very high density of automobiles and industrial activities,which leads to high levels of $SO_2$ in the atmosphere.This high concentration of $SO_2$ prevents the growth of lichens in Delhi.In contrast,places like Manali or Darjeeling have cleaner air with significantly lower levels of $SO_2$,allowing lichens to grow abundantly.

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

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