If you can't afford an expensive air filter to deal with the smog in China, you can build a DIY model | The World from PRX
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On A Back-To-School Supply List: Materials For DIY Air Purifiers : Back To School: Live Updates : NPR
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On A Back-To-School Supply List: Materials For DIY Air Purifiers : Back To School: Live Updates : NPR
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How to make a box fan filter to clean indoor air of smoke | Interdisciplinary Center for Exposures, Diseases, Genomics and Environment
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