[jaqalopes]

Ancedotally they work 100%. Not only do they remove noticeable odors, they suck up tons of allergenic dust and invisible particulates that can mess with your breathing (if you have a sensitive respiratory system).

Non-anecdotally, I've heard it claimed that indoor air pollution is the #1 factor in reducing the lifespans of otherwise healthy people. No idea if this is the case or what the evidence is, but I don't find it hard to believe.

[Rastonbury]

In developing countries they have poor stoves at home which give of smoke/CO which is harmful aka indoor air pollution. A good easy way to prevents deaths/harm from these is to provide them with quality stoves. So depending on where you heard it, air pollution could mean these stoves which typical don't exist in the developed world

[legulere]

Frying things even on induction still easily drives particulate matter pollution to levels of bad days in China/India.

[Rebelgecko]

Even in developed countries, I think most homes still have gas stoves which are bad for indoor air quality.