Why the lichen is known as natural pollution indicator?
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Lichens are regarded as pollution indicators because they are sensitive to sulphur dioxide (SO2) and do not grow in polluted areas. Their presence indicates the absence of pollution in an area, and their absence indicates that the area is polluted
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Lichens can be used as air pollution indicators, especially of the concentration of sulphur dioxide in the atmosphere.Air pollutants dissolved in rainwater, especially sulphur dioxide, can damage lichens and prevent them from growing. This makes lichens natural indicators of air pollution.
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