Can I wear a mask to run in foggy days?

Running with a mask is not recommended in foggy days.

In smoggy weather, wearing a mask will make people feel poor breathing, appear symptoms of hypoxia, affect the normal performance of muscles and joints during exercise, lead to hypoxia in internal organs, and lead to very serious health hazards. Masks will increase the resistance to breathing, increase the burden on the heart and lungs, make the running effect worse, and cause respiratory infections and other problems.