It is sunny today. Why is there fog? Is it smog or water?

You can feel the humidity of the air, and you can obviously feel that fog is the humidity of the air. When the sun shines high at noon, it is haze or a mixture of fog and haze.

It is important to protect yourself in foggy weather. In foggy days, we can try to reduce the time outdoors. We can install a fresh air system at home, and we can breathe fresh air at home. My home decoration is a five-degree and five-constant fresh air system, and the effect is good.