How to protect yourself in foggy weather?

Pay more attention to foggy days and try to reduce going out. If you want to go out, you'd better wear a mask and remember to wash your hands and face when you come home from the outside. Then you can eat more fruits such as pears and loquats. Due to the severe smog weather, we can't open the window for ventilation, which can easily cause indoor air circulation. This can be equipped with an air purifier. My home is a Linyang air purifier, which can effectively filter PM2.5 particles, and an activated carbon filter screen, which can remove household odors such as formaldehyde and second-hand smoke. In a word, smog is not a weather phenomenon, and we must realize its harm.