Where does air pollution come from?

Looking at how much pollution is from energy, solar does seem to be the best thing that can happen in current timeline to humanity. Global warming AND pollution gone in a single stroke.

Solar panel price have never been so low. It's only a matter of time before 'the invisible hand of economy' makes people buying them en masse.

It's already doing that but progress is hindered by installers that overcharge due to high demand and due to utility companies trying to cushion their blow of upgrading their infrastructure and doing all sorts of shenanigans.