What are the four most polluted cities in China?

Experts pointed out that the smog in many key areas of the country is getting worse: the smog in urbanized cities and heavy industrial cities such as Pearl River Delta, Yangtze River Delta, Beijing-Tianjin-Hebei and Northeast Plain is more serious than in other areas.

He Lifu, chief forecaster and research-level senior engineer of the Central Meteorological Observatory of the National Meteorological Administration, said that if we want to talk about macro direct causes, the increasingly frequent haze weather is the cause of global warming, urbanization of human activities and air pollution.

He Lifu also said that compared with previous years, this year's fog has four characteristics: "wide range, many times, long time and' smog'".

One of the characteristics of this fog is the widespread appearance of "foggy days". Since the winter, fog has fallen in the north of China, especially in the east, and it is rare to see many areas covered.

Another feature is that there are too many days. He Lifu said that among the weather warning information released daily by the Central Meteorological Observatory recently, there are 40 issues about fog warning. And often appear. After entering 65438+February, the foggy weather in Beijing and Tianjin has almost become the norm, especially at night and in the morning, people are often in fog.

Heavy fog and long duration are another feature of recent foggy days. Experts said that although autumn and winter are foggy seasons every year, it is rare to see such concentrated and persistent foggy weather this year.

This year, the "haze" weather in heavy fog has obviously increased, which is particularly obvious, especially for people in Beijing and Tianjin. The "smog" weather often lasts all day, and the air feels dirty and stuffy, and the line of sight is gray and blurred. He Lifu pointed out that "smog" weather can not be ignored, which is more harmful to human health than foggy days.