Pollution is contamination of land, air and water. Plastics are a big nuisance because they cause pollution. Plastic never decays. If we burn it, it pollutes the air we breathe. If we dump it in rivers or the sea, it pollutes the water and kills marine life.
Chemical fertilisers are another source of pollution of land and water. In order to check pollution, the polluted effluents from factories should be treated suitably before being disposed of in water bodies. Plastic and other materials should be recycled wherever possible. New techniques should be adopted in motor vehicles to reduce pollution from engine exhausts. All these measures can reduce the effects of pollution.
Various other measures may be adopted to control pollution. To trap solid particulate matter emitted by chimneys, appropriate filters should be used. Lofty smokestacks should be built. Gases should be discharged through exhaust pipes higher in the air. Chemical industries should not be allowed to be set up on the banks of rivers.
In view of the great danger to mankind, many countries in the world, including India, have passed laws to prevent pollution. But it has been seen that anti-pollution laws are not being obeyed rigorously, pushing up pollution to new levels.