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What is an Environmental Pollutant? A pollutant is any form of energy or matter causing pollution. In air pollution the pollutants include gases, and solid and liquid particles of both organic and inorganic chemical classification. Water Pollution includes presence of disease-producing (pathogenic) bacteria and viruses (biological pollution) and of undesirable ions and compounds in solution (chemical pollution). Presence of solids causing turbidity may be included as forms of water pollution. Thermal Pollution of air and water, a form of energy infusion, raises the quantity of sensible heat in those fluids to abnormally high levels. Noise Pollution illustrates energy infusion into the environment by sound wave transmission.

Particulate Matter in the Atmosphere: The contents of the atmosphere fall into two basic categories: Particulate matter and gases. Particulate matter consists of particles of matter in either the liquid state or the solid state. In the language of air pollution science, these particles are called Particulates. Particulate matter injected into the atmosphere is of both Man-made and natural origins.

These compounds are important in producing atmospheric haze that builds up naturally within stagnant air masses far from industrial pollution sources. Man-made particulate matter comes from many sources but the major source is the combustion of hydrocarbon fuels - petroleum products, coal, peat, and wood. Combustion of solid wastes is another source. Other kinds of particulate matter are introduced into the atmosphere in the form of manufactured chemicals, refining fossil fuels, mining and smelting ores, quarrying, cement manufacturing, and farming activities.

Convection, another mechanism of the rise of particulates, consists of updrafts somewhat like the rise of hot air in a chimney. Many industrial sources, particularly large smokestacks emit hot air that rises rapidly in a column because the air is less dense than its surroundings. In this way many pollutants can be carried up many hundreds of feet before the heat of the rising air column is lost to the surrounding air, halting further rise.

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  Blog créé le 17-09-2011 à 09h13 | Mis à jour le 23-02-2012 à 04h14 | Note : Pas de note