Why is the smog worse after the rain?

The reason why smog is worse after rain is because smog is actually small particles. When it rains, the air humidity is high, and the smog particles in the air will absorb more water, so they will fall to the ground. Haze is a combination of fog and haze. In many areas of China, fog and haze are combined as disastrous weather phenomena for early warning and forecasting, which are collectively called "haze weather".

Haze is the result of interaction between specific climatic conditions and human activities. The economic and social activities of high-density population will inevitably emit a large number of fine particles (PM 2.5). Once the emission exceeds the atmospheric circulation capacity and carrying capacity, the concentration of fine particles will continue to accumulate. At this time, if it is affected by calm weather, it is easy to have a wide range of smog.

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Fog seems mild, but it contains more than 20 kinds of fine particles and toxic substances harmful to human body, including acid, alkali, salt, amine, phenol and so on. , as well as dust, pollen, mites, influenza virus, tuberculosis, pneumococcus and so on. Its content is dozens of times that of ordinary atmospheric water droplets. Haze is more harmful to people's health than fog.

Because the diameter of fine powdery floating particles in smog is generally below 0.0 1 micron, they can directly enter bronchi and even lungs through the respiratory system. Therefore, the biggest impact of smog is the human respiratory system, and the diseases caused are mainly concentrated in respiratory diseases, cerebrovascular diseases, nasal inflammation and other diseases.

At the same time, in the haze weather, the air pressure decreases, the inhalable particulate matter in the air suddenly increases, the air mobility is poor, and the diffusion speed of harmful bacteria and viruses to the surrounding area slows down, resulting in an increase in the virus concentration in the air and a high risk of disease transmission.