When the air turned orange from the Canadian wildfires last year, I had massive, massive headaches from the smoke. On the recommendation of Wirecutter, I bought a Coway, and my headaches cleared up.

I've been very happy with it. The low and medium settings are quiet, while the high setting is a bit noisy for me. When the wildfires were running, I had it on low or medium all the time and it was fine. Since then, I mostly have it on Eco mode, where it samples the air periodically and kicks on at whatever speed it thinks is necessary. Mostly it just quietly pops on at low speed for dust or pollen or whatever, and I rarely notice that it's done so. It always kicks in at high speed for a few minutes after I've changed the cat's litter, and once it noticed that the bread was starting to burn in the oven before we did, lol.

Anyway, I got a Coway based on Wirecutter's recommendation, and I've been very happy with it.

Edit: I got the 200m, which covers like 1700 square feet.