Is it harmful to exercise in foggy weather around six in the morning?

Harmful fog is actually formed by small water droplets in the air adhering to dust in the air, so more fog means more dust in the air (such as "foggy city" London), which is harmful to people's health. In foggy days, the combination of pollutants and water vapor in the air will make it difficult for pollutants to spread and settle, which makes most pollutants gather at the height where people often move. Moreover, some harmful substances will become more toxic when combined with water vapor, such as sulfur dioxide becoming sulfuric acid or sulfite, chlorine hydrolyzing into hydrogen chloride or hypochlorous acid, and fluoride hydrolyzing into hydrogen fluoride. So the air pollution in foggy days is much more serious than usual. Another reason to emphasize is that the particles that make up the fog core are easy to be inhaled and stay in the human body. The amount of air inhaled during exercise is much more than usual, and a lot of particulate matter will be inhaled in foggy days, which further aggravates the harm of harmful substances to human body. In this environment for a long time, the human body will inhale harmful substances, consume nutrients, cause internal injuries to the body, and easily induce or aggravate diseases. In particular, some people with environmentally sensitive diseases, such as bronchial asthma, pneumonia and other respiratory diseases, will have normal blood circulation obstruction, leading to cardiovascular diseases, hypertension, coronary heart disease, cerebral hemorrhage and so on. Experts remind that people should reduce outdoor activities in foggy days, wear scarves and masks when outdoors, and protect skin, throat, joints and other parts. Middle-aged people, the elderly, children and the infirm should pay more attention to protection. In a word, the harm of foggy exercise to the body is greater than the benefit of exercise. Therefore, it is not suitable for exercise in foggy days.