Why is foggy weather not suitable for outdoor sports in winter?

Because fog is composed of water vapor condensate suspended at low altitude near the ground, in densely populated and busy cities, these tiny water droplets often contain some soluble harmful pollutants and pathogenic microorganisms, so foggy days are not suitable for going out for exercise.

The foggy weather layer is stable, which is not conducive to the diffusion of air pollutants, and a large number of harmful gases accumulate in the lower atmosphere. At this time, it is best not to go out for sports activities, so as not to inhale too many harmful pollutants and induce various allergic diseases such as tracheitis, pharyngitis and rhinitis.

There is a lot of water vapor in foggy days, and water vapor condenses everywhere in the air. When people exercise, the oxygen consumption in the body increases, and breathing will inevitably deepen and accelerate, thus inhaling more fog, which will hinder the gas exchange in alveoli, leading to brain hypoxia, dizziness and other uncomfortable symptoms.

The air humidity is high in foggy days. When people run, climb mountains or do other sports, the activities of muscles and bones are enhanced, which leads to a significant increase in heat production in the body and requires a lot of perspiration and heat dissipation. Exercise in foggy days, because of the high pressure and humidity of water vapor, will lead to poor skin heat dissipation, sweat is not easy to evaporate, making people uncomfortable.

When there is fog, the sky is hazy and visibility is poor. When people run and ride bicycles in foggy days, they are prone to accidents because of the heavy traffic and poor visibility. Especially the elderly have poor eyesight and hearing, slow reaction, and are not suitable for going out to exercise in foggy days.