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Approaches to Reduce Air Pollution Air pollution is nothing new. Ever since the discovery of fire, less-than-desirable materials have been vented into the atmosphere. One of the very first air-pollution regulations dates back to the fourteenth century, when King Edward I banned the burning of sea coal in lime kilns. U.S. air-pollution regulations have their roots in British Common Law. But regardless of these efforts, air pollution continues to be a severe local and world-wide issue. Pollution is the pressure in the atmosphere of a number of chemicals that are detrimental to human health, welfare, animal or plant life, or property. Previously with air pollution we've included mainly the outside pollutants, but in recent years this isn't the situation. Today we divide pollutants in to two groups. Primary pollutants, because they come directly from different sources, and secondary that are by-products of chemical connections of the principal pollutants within the atmosphere. Particulates Though air pollution may be thought of as undesirable gases in the air, two of five principal pollutants are extremely solid chemicals called particulates. Soot has ever been a sure indicator of a polluted atmosphere, but besides a negative emotional impact, soot can't settle into the lungs and cause serious ailments. Thick,black smoke coming from a stack is that what we believe causes the pollution, but what really creates the damage is that which we can't see. Particles such as this are known as suspended particles. They come from many incomplete burning and can consist a number of substances. The most damaging kind of particulate is so small that it's microscopic. All the particulates are harmful for several reasons. When inhale...