Comment by Tade0

> That’s lower, but do we care? The first level is already comparable to the least polluted cities on the planet. And most people reading this probably have less drafty windows or cleaner outside air.

I wish. I live in an area that routinely goes to 100ug/m3+ during the winter.

I picked a local brand because it had all the features I wanted: a numerical indicator, ioniser and the filter was aligned vertically, so the device doesn't occupy too much space.

It has a CADR of 300m2/h or ~ 185sq ft/min. That's enough to survive the worst smog events.

I could buy three of those IKEA ones for the price though, which is actually the recommended approach, because air purifiers generally work very locally.