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Pollution
the presence in or introduction into the environment of a substance which has harmful or poisonous effects.

Types of Pollution

1)Air Pollution. 2)Water Pollution. 3)Soil pollution. 4)Noise pollution. 5)Radioactive pollution. 6)Light pollution.

1)Air Pollution
Air pollution is a mixture of solid particles and gases in the air. Car emissions, chemicals from factories, dust, pollen and mold spores may be suspended as particles. Ozone, a gas, is a major part of air pollution in cities. When ozone forms air pollution, it's also called smog. Some air pollutants are poisonous.

2)Water pollution
Water pollution is the contamination of water bodies (like oceans, seas, lakes, rivers, aquifers and groundwater) usually caused due to human activities. Water pollution is any change in the physical, chemical or biological properties of water that will have a detrimental consequence o any living organism.

3)Soil Pollution
Soil pollution is defined as the presence of toxic chemicals (pollutants or contaminants) in soil, in high enough concentrations to pose a risk to human health and/or the ecosystem. In the case of contaminants which occur naturally in soil, even when their levels are not high enough to pose a risk, soil pollution is still said to occur if the levels of the contaminants in soil exceed the levels that should naturally be present.

4)Noise pollution
Noise pollution is generally defined as regular exposure to elevated sound levels that may lead to adverse effects in humans or other living organisms. According to the World Health Organization, sound levels less than 70 dB are not damaging to living organisms, regardless of how long or consistent the exposure is.

5)Radioactive pollution
The radioactive pollution is defined as the physical pollution of living organisms and their environment as a result of release of radioactive substances into the environment during nuclear explosions and testing of nuclear weapons, nuclear weapon production and decommissioning, mining of radioactive ores, handling and disposal of radioactive waste, and accidents at nuclear power plants. Nuclear tests are carried out to determine the effectiveness, yield, and explosive capability of nuclear weapons. The proportion of radioactive pollution is 15% of the total energy of the explosion. Radioactive pollution of water, water sources, and air space is the result of radioactive fallout from the cloud of a nuclear explosion. Radionuclides are the main sources of pollution; they emit beta particles and gamma rays, radioactive substances.

6)Light pollution
Light pollution is excessive and inappropriate artificial light. The four components of light pollution are often combined and may overlap:

Urban Sky Glow—the brightening of the night sky over inhabited areas. Light Trespass—light falling where it is not intended, wanted, or needed. Glare—excessive brightness which causes visual discomfort. High levels of glare can decrease visibility. Clutter—bright, confusing, and excessive groupings of light sources, commonly found in over-lit urban areas. The proliferation of clutter contributes to urban sky glow, trespass, and glare.