Air pollutants can seriously harm materials, crops and to livestock. They can spoil fabrics, surface coatings, metals and other commercial materials, sulher compounds  can Corrode or damage many metals, stones, electrical equipment, painted surface, textiles, paper and leather. These pollutants create the pollution in the air. Industrial wastes, petrol and diesel automobiles etc. and thermal power stations make pollution in the air. The air pollution effects all life activities of all animals and plants also.