After the rain, the suspended matter is brought to the surface by the rain gas, and the air visibility is high, and the distant mountains that are usually blocked are clearly visible.
The air in industrialized areas is mostly like this. I don't usually think so. Only after the rain did I find the sky bluer and everything clearer.
Once I was flying in Wuxi, and the plane rose to a certain height. I looked down and suddenly froze:
There is a thick "quilt" over Wuxi on a sunny day, just like a dark cloud on a rainy day. Above the "artificial cloud", I saw Wan Li. How sad it is to live in such a dirty environment every day!