Air purifiers

Are white noise machines that happen to filter air. 

The air filter does collect dust. Whether it makes a huge difference on my health or not, I can't really tell. 

Originally I bought it because I lived in an older apartment with mold problems. I thought it would help me breathe a little easier. Maybe it did. What really came in handy was using it to drown out the neighbors while working from home. That and for falling asleep.

I don't think anyone likes their air purifier for the same reason they bought it.