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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 ip26 on Tuesday November 13, 2018 @07:35PM (#18446277)
I don't know about 0.3 micron, but all the different sizes tend to come together. Presence of PM2.5 implies PM0.3

I've got a foobot, I like it. It was benchmarked by some gov't agencies and found to track pretty well.

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