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A comment on Build a do-it-yourself home air purifier for about $25. Parent comment

Re:Build a do-it-yourself home air purifier for about $25 by wildfire_smoke on Tuesday November 13, 2018 @10:12PM (#18447160)
Just got one of these - seems to correlate pretty well with the airnow.gov outdoor measurements https://shop.hellowynd.com/
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