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 is that the particles that make up the fog core are easily inhaled and easily left 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.
Extended data
The difference between fog and haze:
1, the relative humidity is different. The relative humidity of fog is more than 90%, haze is less than 80%, and the relative humidity is between 80% and 90%. It is a mixture of haze and fog, but its main component is haze.
2, the thickness varies. The thickness of fog is only tens to hundreds of meters, and the thickness of haze can reach 1-3 kilometers.
The change is different every day. Fog is most likely to appear from midnight to early morning; The diurnal variation characteristics of haze are not obvious. When there is no big change in meteorological conditions and the atmosphere is stable, it lasts for a long time.
People's Network-What's the difference between fog and haze (window of knowledge)
Baidu encyclopedia-fog