Industries cause different types of pollution—land, air and water.
- Air pollution is caused by the release of undesirable gases and smoke like sulphur dioxide, carbon monoxide.
- Air-borne particulate materials like dust, sprays, mist and smoke cause air pollution.
- Smoke is emitted from chemical and paper mills, brick kilns, refineries, smelting plants.
- Burning of fossil fuels in big and small factories which do not follow pollution norms. Toxic gas leaks can be very hazardous with long-term effects.
- Air pollution adversely affects human health, plants and animals. In human beings, air pollution can cause respiratory problems. Smog in the atmosphere cause respiratory problems.