Why are lichens called indicators of air purity?

Recently, lichens have been used as a bioindicator of air pollution. Their similar property was revealed as a result of research back in the 19th century.

About 15,000 schoolchildren were involved in lichen research in the UK. And it was revealed that epiphytic lichens are the most sensitive to environmental pollution. On the basis of their distribution or absence in a particular territory, it is possible to judge with almost 100% certainty about the purity or pollution of the air.




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