What about wet and foggy weather?

1, open the window less in foggy days.

It is not recommended to open the window for ventilation in the morning and evening in foggy weather. It's best to wait until the sun comes out before opening the window for ventilation.

Step 2 wear a mask when you go out

You can wear a mask when you go out, which can effectively prevent dust particles from entering the body. Cotton masks are the best because some people are allergic to non-woven fabrics, while cotton masks are generally not allergic and easy to clean. When you come back from going out, you should wash your face and expose your skin immediately.