What harm does fog do to human body?

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 that needs to be emphasized is that the particles that make up the fog core are easy to be inhaled and stay in the human body, while the amount of air inhaled during exercise is much more than usual, and there will be a lot of particles inhaled during exercise in foggy days, further aggravating the harm of harmful substances to the human body.

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Extended data;

Fog is a weather phenomenon in which water vapor in the air condenses into water droplets or ice crystals when the temperature in the near-surface layer drops to or below the dew point, and is suspended in the near-surface layer atmosphere, so that the horizontal visibility is less than 1 km.

The basic cause of fog can be explained by its definition. One is that the water vapor in the air condenses into fog under the condition of constant air temperature, which increases the pressure of water vapor to air saturation. Second, the water vapor content in the air remains unchanged, mainly because the temperature decreases. When the temperature drops to the dew point, the saturated water vapor pressure becomes smaller and the water vapor condenses into fog.

The process of air cooling mainly includes radiation cooling, contact cooling, mixed cooling and adiabatic cooling. Of course, it is best to increase the steam and lower the temperature. These two ways work together to realize water vapor condensation, which is beneficial to the formation of fog.

According to the change of surface temperature and the influence of atmospheric advection process on the surface, it is determined that there are different forms of fog formation. Such as radiation fog, advection fog fog, evaporation fog and frontal fog fog, their respective forming conditions are different according to the above reasons.

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