Pollution-control technicians, also known as environmental technicians, are people who conduct tests and investigations determine a number of ways to prevent and control contamination of air, water, and soil. They conduct several laboratory and field procedures to determine the chemicals or bacteriological activity of different kinds of specimens. In these specimens, water samples from lakes, rivers, and streams are collected and tested. Liquid industrial discharges and other processed or unprocessed wastes are found in the water. A few technicians set up monitoring equipment to find information on temperature, water flow, turbidity, pressure, and other factors, while recording readings from these devices clearly and accurately. They trace flow patterns and may introduce dyes into the water. They spend a great part of their workday outside. They also spend it in bad weatheraboard boats, or sometimes near unpleasant smells. To become a technician, one must have graduated from high school and had two years of training. The average salary of a pollution-control technician is $24,800 a year. Environmental pollution is an ancient problem. Some bodies of water become reservoirs of chemical waste and life threatening microorganisms from untreated sewage, making living conditions nearly intolerable because of the odors and insects. The air, in some cases was and is heavily contaminated with an assortment of gases and some particles. They all contribute to respiratory ailments. After World War II, the public began to see the water and the air deteriorating because of pollution. Then responsible action was taken to minimize the damage. In present day, the public's concern has developed about the saftey of hazardous waste such as toxic chemicals and industry unsafe products.

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