KonaRain Posted June 13, 2014 Share Posted June 13, 2014 http://beta.pri.org/stories/2014-06-02/if-you-cant-afford-expensive-air-filter-deal-smog-china-you-can-build-diy-model .B.C.'s PRI radio told of a particle filter for the worst days in China.. Measured by a particle meter. Equivalent performance is big bucks in Beijing.. cost about $30. Priceless if You ask Me. here's the link... Link to comment Share on other sites More sharing options...
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