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Water falling through the air bumps into molecules of pollutants (SOx, dusts, organics, NOx, etc.) and washes them out of the air. These then fall as rain or snow.

This same processs (water bumping into dirty air) is used as an industrial pollution control system. The system is called a water scrubber. In that case the dirty water is collected for further treatment awhile the clean air is allowed to exhaust to the atmosphere.

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16y ago

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