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Control of environmental pollution involves the application of a range of engineering, chemical, and biological measures to reduce the release of harmful substances into the air, water, and soil. Suspended particulates, volatile organic compounds (VOCs), and pollutant gases are major contributors to air pollution, each requiring specific control strategies tailored to their physical and chemical characteristics. Effective pollution control not only improves environmental quality but also safeguards public health and meets regulatory standards. Suspended particulates, often referred to as particulate matter (PM), include fine solid particles or liquid droplets suspended in the atmosphere. These may be emitted directly from combustion processes, industrial operations, and natural sources, or formed in the atmosphere through chemical reactions. Their control methods fall into two main categories: gravitational and inertial methods, and filtration or scrubbing techniques. Gravitational settling chambers utilize the principle that heavier particles settle under gravity when the flow velocity of the gas stream is reduced. While simple and low-cost, these are mainly effective for larger particles above 50 microns. Cyclone separators, using centrifugal force, are widely used for medium-sized particles. In these devices, polluted air enters tangentially into a cylindrical chamber, creating a vortex; particles are thrown to the walls and collected. For finer particulates, fabric filters or baghouses are employed, where the gas passes through tightly woven or felted fabric, trapping particulates on ____ ____ ______ _____ ________.
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