(C) Lichens,such as $Usnea$,are widely recognized as bioindicators of air pollution. They are extremely sensitive to atmospheric pollutants,especially

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(C) Lichens,such as $Usnea$,are widely recognized as bioindicators of air pollution. They are extremely sensitive to atmospheric pollutants,especially sulfur dioxide $(SO_{2})$. In areas with high levels of $SO_{2}$,lichens fail to grow,making their presence or absence a reliable indicator of air quality.