Acid rain is an after effect of air pollution. When sulphur dioxide and nitrogen oxides formed with pollutant smoke from burning coal, industries, power plants etc. are being transported by prevailing wind, they form secondary pollutants such as nitric acid vapour, droplets of sulphuric acid and particles of sulphates. These chemicals descent on earth in two forms- 1. Wet as acid rain and 2. Dry as acid particles.
Acid rain has many harmful effect on environment and human health. It causes respiratory diseases like bronchitis, asthma etc. It also damages statues and buildings, metal surfaces, automobile finishes etc. It also damage tree foliage and deplete the calcium and magnesium in the soil which in turn reduce the tree growth.
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