Is the smog in Beijing comparable to that in London?

The smog event in London on February 5th, 1952, 1952, was similar to the smog that happened in Beijing, China not long ago, but also different. The similarity lies in the seasons, which all happen in winter. The diffusion conditions in winter are not good, and it is easy to form an inversion layer (simply speaking, the surface temperature is low, the upper temperature is high, and the diffusion of pollutants is difficult, mostly in winter). Pollutants cannot spread and can only be deposited near the surface. The smog event in London is also in winter, and the meteorological conditions are similar and more extreme. The inversion layer is extremely low, less than 500 meters (some people say it is 150 feet, about 76 meters) and lasts for several days. According to statistics, the fog and haze incident in London caused about 1 10,000 deaths in a short time. The difference between the smog days in Beijing not long ago and the smog events in London lies in the different types of pollutants. London is polluted by soot, and now the eastern part of China is basically a compound pollution, that is to say, it includes both soot pollution and secondary particles formed by atmospheric chemical processes. Due to the continuous haze, many people think that the air quality is deteriorating and the pollution is getting worse. Actually, it's not. According to the monitoring data, the air quality has not deteriorated significantly in the past three to five years. The reason why the public feels worse is mainly because now we have a more accurate understanding and description of smog and have corresponding national standards; In the past, everyone thought it was normal to see fog in winter. I don't know if it was smog or pollution.

Tmall us wechat reminds: remember to protect yourself when traveling in foggy days.