Lichens indicate pollution by

O_{3}

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S O_{2}

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N O_{2}

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Solution

The correct option is B $S O_{2}$
Lichens are the symbiotic association of the algae and fungi. These absorb their mineral nutrients from the atmosphere rather than the soil. So, the contamination of the atmospheric air will result in their death. Lichens show specific sensitivity to sulphur dioxide and vanish from the area wherever it is present. So, these are called the indicators of the sulphur dioxide pollution.
Hence, the correct answer is 'SO $_{2}$ '.

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