Ionizers shoot out negative ions. It’s hard to see it happening with these tiny particles, but you’ve seen it on a visible scale if you’ve seen someone rub a balloon on their hair and then stick it to a wall.
There are some problems:
1. When you put that many ions into the air, it produces ozone. Ozone is harmful, so that’s not good!
2. The ionizer didn’t actually filter out the particles. It just made them stick to my bed, wall, and floor.
Those problems are what led Consumer Reports to publish tests and warn people not to buy the Sharper Image Ionic Breeze.
For more explanations and reference, click here to read the article: https://smartairfilters.com/en/blog/do-ionizers-actually-clean-air/