@Mammmood - Yeah, I think you would be much sicker than usual if the body didn’t have a filtering system.
We live in an area where there is a lot of smog and pollution that we have to deal with. It’s good to know that the body has its own mechanisms to deal with it.
However, that doesn’t mean that you can’t overload your system. Every biological process has its breaking point.
So for our home we’ve installed our own filters that we run a lot. I don’t know if these man-made filters are as good as the biological filters, but it’s my hope that together, I can remain relatively healthy despite the challenges of my environment.