How about running in foggy weather in the morning?

Fog is an aerosol composed of tiny water droplets suspended in the atmosphere. In foggy days, it is difficult for pollutants in the air to diffuse and settle when combined with water vapor, and most pollutants will gather at the height where people often move. In addition, some harmful substances will become more toxic when combined with water vapor, such as sulfur dioxide combined with water to form sulfuric acid. Outdoor sports in foggy days are easy to cause harmful substances to harm the respiratory system. If you exercise outdoors for a long time in foggy days, the human body will inhale harmful substances, which will easily induce or aggravate some diseases, such as bronchial asthma and pneumonia. Therefore, it is best to reduce the time of outdoor activities in foggy days, and you must take protective measures when doing outdoor activities, such as wearing masks, scarves and hats. People who are sensitive to the environment should be well protected.

You can choose to exercise indoors in foggy days to avoid being hurt by harmful substances.