observation of water pollution
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The particles that make up the pollution form a visible haze. A thick pollution haze exists in some cities and is known as smog. It is a dark grey or brown in colour. It occurs in the lower layers of the atmosphere usually within a few hundred metres.
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Inorganic and organic matter can also be contaminants. A lot of chemical substances are very toxic. Examples of water pollutants that are organic include: waste from food processing, detergents, herbicides and insecticides, by-products of disinfection, petroleum hydrocarbons, drug pollution, etc.
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