Question

why the pollution and lichens are interlinked

Answer 1

POLLUTION GENERALLY CONTAINS OXIDES OF NITROGEN AND SULPHUR.

ALSO, LICHENS ARE SENSITIVE TO $SO_{2}$

Answer 2

lichens are well known as sensitive indicator of air pollution , particularly for Sulphur Dioxide .they derive there water and essential nutrition mainly from the atmosphere rather than from the soil .it also helps that they are able to react to air pollutants all year round...

l hope it will helps you..