Traditional Culture Encyclopedia - Weather inquiry - When will the air quality in Xi 'an gradually improve?

When will the air quality in Xi 'an gradually improve?

65438+ 10/2. It was learned from the expert judgment meeting held by the emergency headquarters office of the city's heavily polluted weather that with the attack of strong cold air, the air quality in our city will gradually improve on June 65438+ 10/7.

Liu Yong, chief forecaster of Shaanxi Meteorological Observatory, said that from the overall performance of cold air, there were not many obvious cooling processes this winter, but the average temperature was indeed colder. For example, the temperature in northern Shaanxi is 65,438+0℃ to 2℃, the temperature in Guanzhong is gentle, and it is warmer in southern Shaanxi.

Although there are a lot of cold air, the main body of cold air is blocked by the loess plateau when it passes through Guanzhong area, which greatly weakens the cold air and has little effect on the diffusion of pollutants. The dominant wind direction in Xi 'an in winter is the northeast wind, which is blocked by the Qinling Mountains in the south. Due to the accumulation effect in front of the mountain, pollutants are particularly easy to gather, and the weather is calm, so it is difficult to spread. During the period of heavy pollution in winter, the pollution input from Northeast China and Wei Fen River Basin is superimposed with the self-pollution of Guanzhong Basin, resulting in pollution accumulation.

Before 15, most areas in our province were static and stable, with high humidity and poor diffusion conditions. It is predicted that the Guanzhong area is dominated by moderate pollution in recent days, and there may be severe pollution in the local area. With the arrival of a new cold air, the air quality in our city will gradually improve from 17.

13: it's cloudy in northern Shaanxi, cloudy in Guanzhong and southern Shaanxi. There is moderate haze in Guanzhong. The meteorological conditions of air pollution in Xi 'an and Xianyang are Grade 4, which is not conducive to the dilution, diffusion and removal of air pollutants. Other areas are generally or better, with grade 2-3.

14 days: it is cloudy between sunny days in northern Shaanxi and Guanzhong, and cloudy between cloudy days in southern Shaanxi. There is moderate haze in Guanzhong. The meteorological conditions of air pollution in Xi 'an and Xianyang are Grade 4, which is not conducive to the dilution, diffusion and removal of air pollutants. Other areas are generally or better, with grade 2-3.