For those who are worried about indoor air pollution like me, I found out thanks to this [dynomight post](https://dynomight.net/ikea-purifier/) that having an efficient air purifier is a low bar and is actually quite accessible to poor people like me !
I ended up purchasing a Lasko Air Flex[1]. It fits standard HVAC filters. It doubles as a white noise machine for me, it is quite loud. This review[2] indicates it works well but a bit power hungry, and it definitely gathered a visible amount of dust over a 1 year period.
[1] https://lasko.com/products/lasko-air-flex-2-in-1-20-inch-box...
It's a pretty common method in industry (a wet scrubber) but I don't know of any indoor-scale, self-contained units - it sounds like a recipe for mould because a misting one would basically be a humidifier too, and they are hard to maintain because bacteria like legionella can grow in the water and then you're dispersing it inside your house!
Even cheaper is the DIY Corsi-Rosenthal box. We make a couple every few months and it does make a huge difference! Worked wonders during the wildfires a couple of years ago
https://cleanaircrew.org/box-fan-filters/