Industry controls air pollution with equipment that removes contaminants at the end of the manufacturing process. Many such devices exist and are described in the next sections. These devices display two characteristics: the size and cost of the equipment increase with the volume of gas cleaned per unit of time, and the cost of removing a contaminant rises exponentially with the degree of removal. The degree of pollutant removal is described as collection efficiency, while the operating cost depends on the pressure drop across the unit and its flow capacity.
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