How is air “filtered”/cleaned in nature?

Question

For example, plants help by taking in CO2 and putting out O2. How is pollution and other airborne “waste” eventually removed from the air we breathe?

In: 1

Answer 1

It isn’t. Small particles settle out over time, which means the amount in the air is basically proportional to how fast they’re being emitted – and humans emit them much more rapidly than the natural environment does.