That's an interesting study, but it appears to only study the plants' ability to filter out a few VOCs. HEPA filters won't help with those (you need an activate

That's an interesting study, but it appears to only study the plants' ability to filter out a few VOCs. HEPA filters won't help with those (you need an activated charcoal filter for that... or plants, I guess?), but they will help with particulates, and I'm not sure plants will do anything for those.