Industries pollute the environment in many ways. They cause pollution in four ways-air, water, land and noise.
- Water pollution is caused by the discharge of industrial effluents into the water bodies with treating it.
- Dumping of wastes, harmful chemicals and industrial effluents e.g. packaging, and garbage makes soil useless. It also results in contamination of groundwater through seepage of rainwater.
- Air pollution is caused by release of undesirable gases and smoke like sulphur dioxide, carbon monoxide, air-borne particulate materials like dust, sprays, mist and smoke. Smoke is emitted from paper mills, burning of fossil fuels, smelting plants etc.
- Factory equipments, generators, saws cause noise pollution.
- Thermal pollution of water occurs when hot water from factories and thermal plants is drained into rivers and ponds before cooling.
