Topics: Air pollution, Scrubber, Air pollution control systems Pages: 3 (837 words) Published: March 16, 2013
Pollutants in the air threaten the lives of everything living on earth. They cause acid rain and smog, weaken the ozone layer, increase the chances of cancer and contribute to changing the climate of the world. Pollutants can be invisible and often we don’t even realize that we’re making them. Polluted air travels with the wind, affecting all of us, whether or not we are responsible for it. Smog aggravates heart and respiratory diseases. Acid rain erodes buildings, hurts plants and trees and kills marine life by poisoning lakes. Metal particles and vapors from fuel, called air toxins, cause lung and respiratory problems. Chemicals like methane and carbon dioxide are found in refrigerators and air conditioners. These chemicals last a long time in the atmosphere and make holes in the ozone layer and contribute to global warming. Some of the causes of these pollutants are more obvious than others. While automobiles, chemical plants and industrial factories are commonly known culprits, paints, dry cleaners, farm equipment, lawn mowers and various household products are also contributing to the problem. Pollutants:-

An air pollutant is known as a substance in the air that can cause harm to humans and the environment. Pollutants can be in the form of solid particles, liquid droplets, or gases. In addition, they may be natural or man-made. Pollutants can be classified as primary or secondary. Usually, primary pollutants are directly emitted from a process, such as ash from a volcanic eruption, the carbon monoxide gas from a motor vehicle exhaust or sulfur dioxide released from factories. Secondary pollutants are not emitted directly. Rather, they form in the air when primary pollutants react or interact. An important example of a secondary pollutant is ground level ozone — one of the many secondary pollutants that make up photochemical smog. Some pollutants may be both primary and secondary: that is, they are both emitted...
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