Why can't you see the stars in the night sky in Guangzhou?

Guangzhou is one of the cities in China with 10 vehicles, which is caused by the exhaust gas emitted by vehicles every day. Coupled with the emissions from chemical plants in the Pearl River Delta and other factories in Guangzhou, a little oxygen in the sky burns a lot. When you look at the stars, you need to mix oxygen with the light of the stars to see them, but when you burn oxygen, you can't see them. One more thing, Guangzhou can't see many stars in the geographical position of the earth. You can tell them the truth online.