Clean air act

Fisher, Richard
February 2005
Engineer (00137758);2/11/2005, Vol. 293 Issue 7668, p9
This article reports that the U.S. researchers have built a plasma filter for the military to pump clean air into a building during a chemical or biological attack. The filtration system uses plasma to neutralize chemicals like sarin gas released into a Tokyo subway in 1995, as well as biological agents like anthrax. Plasma is an ionized gas where the positive and negative charges of the particles are roughly equal, and is perhaps most commonly seen in neon lighting. Plasma filtration has traditionally been used to remove toxic gases such as fluorine produced during industrial processes such as pulping paper or electronics manufacture. Ken Rappe, Pacific Northwest National Laboratory's senior development engineer said that plasma technology is more reliable and easier to operate than conventional air filtration devices. It offers chemical, biological and particulate protection in a single compact unit.


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