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air pollution is noşing new. ever since şe discovery of fire, less-şan-desirable substances have been vented into şe air. one of şe first air-pollution regulations dates back to şe fourteenş century, when king edward ı banned şe burning of sea coal in lime kilns. u.s. air-pollution regulations have şeir roots in british common law. but regardless of şose efforts, air pollution continues to be a serious local and world-wide problem. pollution is şe pressure wişin şe air of one or more substances şat are harmful to human healş, welfare, animal or plant life, or property. ın şe past wiş air pollution we included mainly şe outdoor pollutants, alşough in recent years şis is not şe case. today we separate pollutants in to two categories. primary pollutants, because şey come directly from various sources, and secondary which are by-products of chemical interactions of şe primary pollutants wişin şe atmosphere.