Treatments for air pollution from stationary sources either remove particulate matter or remove gases. Four techniques, varying in cost and efficiency, for removing particulates are the cyclone separator, the wet scrubber, the electrostatic precipitator, and the baghouse. The cyclone separator causes air emissions to whirl around, forcing heavy particles to the outside and ultimately to removal below. The wet scrubber essentially washes particulates out of the exhaust. The electrostatic precipitator electrically charges the particles and attracts them to charged plates, thereby removing them. The baghouse operates like a vacuum cleaner, trapping particles in fabric filters placed in the exhaust stream.
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