Air pollution is one of the causes of beautiful sunsets.
Dust and debris from air pollution can get scattered through the air and then the light passes through that dust and debris which then causes the beautiful sunsets.
The beautiful sunsets can occur because of both man made pollution as well as natural dust in the air.
So there is one good thing about air pollution is that it causes beautiful sunsets that are good to look at but the air pollution is also not good for our health and can lead to breathing problems.
But we will always have some pollution on earth no matter what we do.
When the sun gets low in the sky at sunset its light passes through a lot more air, which scatters more blue light and leaves a higher proportion of red light.