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Barystatic filter

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A baristatic filter was a device which removed pollutants from a planet's atmosphere.

The filter functioned by projecting negatively-charged ions into the stratosphere, which then transferred their charge to atmospheric pollutants. The thus-charged pollutants were then collected by the positively-charged intake vents of the baristatic filter. A consequence of this system was that an ionic current was set up in the planet's atmosphere, which on a large enough scale could interfere with the function of transporters.

A thousand baristatic filters were installed on Tagra IV in an effort to combat their pollution problem. (TNG: "True Q")

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