[OJFord]

> Lungs of a person act as a perfect purifier.

Is that good?

I mean, of course it's good that PM doesn't just pass straight into our bloodstream, but isn't our lungs doing the purifying exactly the thing that people try to avoid with mechanical air purifiers?

[cosmolev]

It is bad of course! PM does pass straight into our bloodstream.

I was just talking about the test setup. A test of any purifier should be compared to a test with a person in a room without purifier. Otherwise those results are not significant.

[lm28469]

The whole point of filtering air for PMs is to avoid having them in your lungs so I'm pretty sure that's not "good".

[OJFord]

Yes, that is what I said.