Air pollution: Air is a mixture of various gases in a particular ratio. Whenever the ratio of these gases becomes imbalanced or if there is an addition of particular substances, foreign material or gases in the air, which may be harmful, the air is said to be polluted. Various air pollutants are carbon dioxide, carbon monoxide, sulphur dioxide, fluorides, smoke, ozone, hydrogen chloride, ammonia, pollen and microbes, pesticides, oxides of nitrogen, dust, iron-filings etc.
Water pollution: Water becomes polluted when it changes in its quality and composition directly or indirectly by man’s activity, making it less suitable for drinking, domestic and other purposes.
Noise pollution: When there is too much noise in the environment it is harmful for human hearing. Noise pollution may be caused by industries, horns of vehicles, music systems and construction activity.
