Lichens are highly sensitive to air pollution, particularly sulfur dioxide. Delhi, with its significant vehicular traffic and industrial activity, has high levels of air pollution, making it unsuitable for lichen growth. In contrast, Manali and Darjeeling, being located in less polluted forested regions, provide a more favorable environment for lichen growth.
Elaboration:
Air Pollution:
Lichens are considered bioindicators of air pollution because they readily absorb pollutants from the atmosphere, including sulfur dioxide, which damages their tissues.
Delhi’s Pollution:
Delhi’s air quality is often severely polluted due to heavy traffic, industrial emissions, and other sources. This high concentration of pollutants makes it difficult for lichens to survive.
Manali and Darjeeling:
These regions, being more remote and surrounded by forests, experience less air pollution. The cleaner air allows lichens to thrive in these areas.
Lichens as Bioindicators:
The presence or absence of lichens can be used as a measure of air quality. Their sensitivity to pollution makes them valuable indicators of environmental health.