When excessive acid comes down in form of rain with ordinary rain water, it is called acid rain. It generally occurs in the over-industrial areas where air is acutely polluted by poisonous gases. It is very harmful to trees, crops, buildings and even human health. This environmental problem is newer but no less harmful than other problems. It contains harmful chemicals from fact gases. Breathing in those chemicals can harm people causing chest illness. It spoils drinking water and water of ditches fishes live in. Moreover, acid rain fades the color of paints, weakens leather and washes away building materials. However, acid rain is mainly caused by gases and chemicals mixed in the polluted air from mills, factories and different vehicles. The problem of acid pollution is worsening day by day. So, it is high time the world took measures to free our environment from pollution to control acid rain.
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