Pollution :Air, Noise and Radiation
One of the greatest problems that the world is facing today is that of environmental pollution, increasing with every passing year and causing grave and irreparable damage to the earth. A pollutant is a waste material that pollutes air, water or soil. Three factors determine the severity of a pollutant: chemical nature, concentration and persistence. Pollution is the introduction of contaminants into the natural environment that cause adverse change. Pollution can take the form of chemical substances or energy, such as noise, heat or light. Air pollution, noise pollution, water pollution, radiation pollution and soil pollution are types of pollution. Air pollution is the degradation of the quality of air by substances which affect the normal living of organisms. Air pollutants can be classified into two major categories, particulate and gaseous. There are two source of air pollution: natural source (storms, volcanoes, forest fire) and man-made source (vehicles, industries, garbage). Noise is a pollutant which is distracting, irritating, and causes noise pollution. Sources of noise pollution are automobiles and trains, work station, jet aeroplanes, radio and television, loudspeaker and musical parties. Radiations are high energy particles, used to diagnose any abnormality in the body. Radiations from radioactive substances are used to generate electricity in nuclear power plants. Use of radioactive chemicals poses the biggest threat to the existence of life on earth.
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