Introduction
Nowadays, the air pollution is one of the most serious problems faced by mankind resulting from growing population, increasing density in domestic areas, traffic etc. Air pollution caused by SO2 is rapidly increasing with economic activities both in small and metro cities in India. It is a fact that visible symptoms of injury can be seen on plants due to automobile exhaust pollutants. Air pollutant from automobile exhausts affect vegetation and causes injury by alterations in metabolism, reduction in photosynthesis, foliar necrosis, defoliation and growth reduction.
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