How are lichens the best indicators of pollution?

Lichens are very sensitive to sulphur dioxide pollution in The air. Since industrialisation, many lichen species have become extinct in large areas - Lichens are widely used as environmental indicators or bio-indicators. read more

Lichens can be used as air pollution indicators, especially of the concentration of sulfur dioxide in the atmosphere. Factories can cause air pollution Lichens are plants that grow in exposed places such as rocks or tree bark. read more

Lichens are mutualistic associations of a fungus and an alga or cyanobacterium and occur as crusty patches or bushy growths on trees, rocks and bare ground. The names given to lichens strictly refer to the fungal partner; the algae have separate names. Lichens are very sensitive to sulphur dioxide pollution in the air. read more