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> The other studies are much longe term and look at things like decades of exposure at city scale.

Are they? Several towards the end of the list are specifically about short term day-to-day effects across a range of situations.

> There’s a footnote that says many weren’t even used.

Quite damning if true.

> they didn’t even detect the VOCs they were trying to filter before they started filtering

That is confusing the reasoning that led to the company footing the bill versus what was being looked at here. The lack of VOCs is actually in the author's favor as it eliminates "exposure to atypical VOCs" as an otherwise fairly severe confounding factor.