Pollution is the introduction by humans of substances or energy into the environment that are liable to cause hazards to human health, species, and ecosystems; to damage structures, ecosystem services, or amenities; or to interfere with economic uses of the environment. As a sound bite, pollution is something in the wrong place at the wrong time in the wrong quantity. Pollution can come in the form of energy (noise, light, heat, or radioactivity); or in the form of a substance (a vast number of chemical elements and compounds, smog or soot). Pollutants are viewed in many ways: by their organic or inorganic chemistry; by their state as liquid, gas, or solid; by their biodegradability or persistence; by the environment where they can be found (marine, soil, freshwater, air); by their source (industry, agriculture, power plants); or by their targets (crops, wild species, buildings, infants, the elderly, etc.). photo source

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Chemical Pollution photo source	Energy Pollution photo source	Global Pollution photo source
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Keywords

hazards, toxics, human health, ecosystem health, noise pollution, light pollution, heat pollution, thermal pollution, radon pollution, radioactive pollution, nucleotides pollution, dust, soot, smog, smaze, smoke, water pollution, air pollution, soil pollution, industrial pollution, agricultural pollution, household pollution, military pollution, microbial pollution, fungal pollution, pollution sources, pollution target, chemical pollution, point source, nonpoint source