I’m running a Xiaomi air filter. Not connected to wifi.

Even without wifi access it is vastly superior to previous choices. At similar pricing to my previous one.

I’m quite wary of the whole monitoring scene but my next air filter purchase will be a Xiaomi again.

Can’t really speak to their other products but on that front they have made a convert out of me despite my aversion to questionable data practices.

Also apparently it’s home assistant compatible. So HA it and firewall it off is the plan