The weather in Tianjin is half a month.

In winter in the north, smog will come, and the whole city is wrapped in dense fog, just like a fairyland. However, dust, sulfuric acid, nitric acid and other particles floating in the smog have caused serious harm to the human respiratory tract and lungs. The topic of smog control has been discussed for a long time, and the country has made great efforts to control smog, but the effect is not ideal.

Some netizens even wrote a poem: the misty capital is thick and the hometown is foggy. You can also fix the truth at home without going to Qingcheng Mountain. Want to make a phone call for this little brother! Haze may be late, but it will never be absent!

Why is the smog in the north much worse than that in the south? First of all, geographical reasons. Winter in the north is very dry and the vegetation is deciduous broad-leaved forest. Leaves will fall in autumn and winter. The purification function of vegetation is basically not expected. From the external economic factors, in fact, the population density in Shanghai is higher than that in Beijing, and the industrial development in the north and south is similar.

The land in the north is hard and desertification is serious. Dry air and monsoon increase the floating objects in the air, and more seriously, it will cause sand and dust. The humidity in the south is high, it often rains, and the pollutants in the air stay for a short time. The vegetation of evergreen broad-leaved forest can continuously purify the air. So the smog rages in the north in winter. There is indeed much more dust in the north than in the south.

Let me give you a simple example. I lived in Shanghai for a while and only washed my car once every half month. Going to my hometown, my hometown is in the Central Plains, and driving outside for a day is dirtier than driving in Shanghai for half a month. Wash the car once every three days, and the car will have a super thick layer of soil. You can imagine how dirty the air is.

In winter, central heating is adopted in most parts of northern China, with coal as the main heating mode. Coal combustion produces a lot of smoke and harmful gases, such as sulfur dioxide and carbon monoxide, which are discharged into the air. In the south, mainly electric heating, clean energy, air pollution is relatively light.

The north is mainly inland, and the smog will last for several days, waiting for the strong wind to blow it away. Therefore, every time it is foggy, we can only wait for the wind!

To sum up, the main reason why the northern winter is shrouded in smog is that it is located inland, with a large amount of coal, relatively high pollutant emissions, dry climate and little rainfall. I really hope to bid farewell to the foggy weather completely!

I am a whiny post-90s girl, sometimes fresh and sometimes funny, sometimes mean, sometimes sweet.