Why is it not suitable to go out in foggy weather?

"Fog" is suspended in the low-altitude ground layer, so it can condense various pollutants in the atmospheric environment, such as sulfur dioxide, nitrogen oxides, carbon dioxide, dust and ozone. So fog not only affects traffic, but also does great harm to human body.

In recent years, in some areas, especially industrialized areas, the emissions of sulfur dioxide and motor vehicles have increased rapidly, and the pollution of nitrogen oxides has risen, causing serious pollution. Experts call droplets with pH less than 5.6 "acid fog&; Rdquo white water weather; If the pH value is less than 4.5, it is "severe acid fog". For heavily polluted cities, if there is fog, it will easily become acid fog, or even "serious acid fog".

Acid fog is more harmful to human body. If carbon dioxide attached to tiny droplets can stimulate the respiratory tract, it can narrow the inner diameter of the respiratory tract; Nitrogen dioxide in fog drops can cause acute asthma attack; High concentration of ozone will seriously damage the lungs and aggravate the condition of patients with cardiovascular and respiratory diseases. Long-term inhalation of acid mist has certain influence on the physique and growth of children and adolescents.

Attention should be paid to the following points in foggy days:

(1) Don't do morning exercises in foggy days, let alone do strenuous exercise in foggy days. Because of the high humidity of dense fog, sweat is not easy to evaporate, and it also makes people feel irritable and sunny. (2) The visibility is low in foggy days, and sometimes the road surface is slippery, so pay attention to safety.

(3) The elderly, the infirm, cardiovascular and respiratory patients and children should go out less to avoid accidents or aggravate their illness.