China News Service, January 31. According to the official WeChat message of the Ministry of Ecology and Environment, the Ministry of Ecology and Environment released the results of the national air quality forecast consultation for the first half of February on the 31st. The results show that in the first half of February, the air quality in the Beijing-Tianjin-Hebei region and surrounding areas, Northeast, Southwest and most of South China was mainly excellent, while the rest of the country was mainly good to lightly polluted. In the later period, due to the impact of fireworks and firecrackers, some cities in the central and southern Beijing-Tianjin-Hebei region, the central and northern Yangtze River Delta, and the Fenwei Plain may experience light to moderate pollution; the northeast and northwest regions may experience moderate and above pollution.
Beijing-Tianjin-Hebei and surrounding areas:
In the first half of February, the northern part of the region was mainly fine, the central and southern parts were mainly good to lightly polluted, and moderate and above pollution may occur locally. Among them, from the 1st to the 6th, due to the influence of large-scale precipitation and cold air, most of the area is mainly fine, and slight pollution may occur locally; from the 7th to the 12th, due to the weak pressure field and early precipitation, the relative humidity is high , the surface wind speed is weak and the diffusion conditions are unfavorable. The northern part of the region is disturbed by the high-pressure system, which is mainly fine. The central and southern parts are mainly good to light pollution, and short-term moderate pollution may occur locally; from the 13th to the 15th, the regional moderate pollution Moderate and above pollution is possible in the south. The primary pollutant is PM2.5 or PM10.
Beijing:
In the first half of February, the air quality is expected to be mainly good, with light to moderate pollution possible during some periods. Among them, from the 1st to the 3rd, controlled by the northeastern cold high pressure, the northeasterly wind is dominant, the temperature is lower, the humidity is higher, the diffusion conditions are more favorable, and the air quality is expected to be good; from the 4th to the 5th, the northeasterly cold high pressure is on the surface, and the northeasterly wind is dominant. Wind, humidity is basically saturated, southwesterly airflow at mid- and high-altitude, strong snowfall is expected, diffusion conditions are more favorable, and the air quality is expected to be mainly good; from 6 to 8, surface high pressure will dominate, northerly winds, diffusion conditions The maintenance is relatively favorable, and the air quality is expected to be mainly excellent; from the 9th to the 10th, the ground will be dominated by cold and high-pressure northerly winds, and the diffusion conditions are more favorable. On the afternoon and night of the 9th, southerly and easterly winds will exist in the area, which will be affected by the setting off of fireworks and firecrackers. Affected by the impact, the air quality is expected to be light to moderate pollution; from 11 to 13, affected by the obvious cold air, cold and high pressure on the ground will lead to northerly winds, lower humidity, and more favorable diffusion conditions, and the air quality is expected to be mainly excellent; from 14 to 14 On the 15th, the influence of cold air weakened, the temperature and humidity increased, diffusion conditions were average, and the air quality was expected to be good. The primary pollutant is PM2.5.
Yangtze River Delta Region:
In the first half of February, most of the region was dominated by good to light pollution, and short-term moderate pollution may occur locally. Among them, on the 1st to 4th, affected by cold air and low-pressure trough, there was precipitation, and the overall region was mainly good; on the 5th, affected by high pressure, the central and northern parts were mainly good, with local slight pollution, and the south was mainly excellent; From the 6th to the 8th, the central and northern parts were located at the bottom of the high pressure, with good to light pollution, the northern part was moderately polluted, and the southern part was mainly fine; from the 9th to the 14th, controlled by the weak pressure field, the central and northern parts were mainly lightly polluted. There was moderate pollution locally, with good to light pollution in the south, and moderate pollution locally for a short time; on the 15th, the central and northern parts were at the bottom of low pressure, with mainly light pollution, with moderate to severe pollution locally for a short time, and moderate pollution in the south. Located at the rear of the high pressure, it is good to lightly contaminated. The primary pollutants are PM2.5, PM10 or NO2.
Fenwei Plain:
In the first half of February, the air quality in most of the region was mainly good to lightly polluted, and moderate or above pollution may occur during some periods. Among them, from the 1st to the 4th, due to the combined influence of cold air and precipitation, diffusion and wet removal conditions were favorable, and most of the area was dominated by good to light pollution. On the 1st, moderate pollution may occur in Guanzhong, Shaanxi. From the 5th to the 8th, the air pressure field weakened and the diffusion conditions gradually deteriorated; from the 5th to the 6th, the pollution was mainly good to light, and from the 7th to the 8th, the pollution was mainly light to moderate. On the 9th and 10th, affected by the northwest airflow, the diffusion conditions gradually improved from north to south in most of the region, with light to moderate pollution being the main issue. From the 11th to the 13th, the northwest airflow continued to affect the airflow, and the diffusion conditions were good. Most of the area was mainly good, and slight pollution may occur locally. On the 14th and 15th, the air pressure field weakened and the diffusion conditions deteriorated. Most of the area was mainly lightly polluted. On the 15th, moderate pollution may occur locally. The primary pollutant is PM2.5 or PM10.
Northeast Region:
In the first half of February, the air quality was mainly excellent in most of the region, with good to light pollution in the central part, and moderate to severe pollution risks in some periods. From the 1st to the 3rd, due to the influence of cold air, the diffusion conditions are favorable. It is expected that the air quality in most parts of the region will be excellent, with local light pollution possible; from the 4th to the 6th, the cyclone will move eastward and northward, with high humidity and average diffusion conditions. , it is expected that central and eastern Liaoning, central and eastern Jilin, southern and eastern Heilongjiang will be dominated by good to light pollution. Some cities in Heilongjiang may reach moderate pollution, and the air quality in other areas will be excellent. On the 7th, affected by weak cold air, the overall spread The conditions are relatively good, and the air quality in most of the region is expected to be mainly excellent, with local light pollution possible; from the 8th to the 10th, the surface pressure field will be weak and diffusion conditions are average, and most of the region is expected to have good to mild pollution. , the local area may reach moderate pollution. On the 10th, affected by the setting off of fireworks and firecrackers, most of the area may experience moderate to severe pollution; on the 11th to 14th, affected by the warm ridge in the air, the temperature will rise and the diffusion conditions will be average. It is expected that most of the area will Mainly good to light pollution, moderate pollution may occur locally; on the 15th, affected by the strong cold air process, diffusion conditions are good, and the air quality in most of the region is expected to be mainly good. The primary pollutant is PM2.5 or PM10.
South China region:
In the first half of February, the overall atmospheric diffusion in the region was good, mainly fine, and moderate pollution may occur in some areas during some periods. Among them, central and western Hubei and the southwestern Pearl River Delta were well to lightly polluted on the 1st; central and eastern Hubei were well to lightly polluted on the 6th and 7th; affected by the setting off of fireworks and firecrackers during the Spring Festival, Guangdong, Fujian, Hubei, Most of Hunan was in good to light pollution, and central and northern Hunan was in light to moderate pollution. On the 10th, most of Guangdong, Guangxi, and Hunan were in good to light pollution, and Hubei, eastern Guangdong, central and western Guangxi, and central and northern Hunan were in good to light pollution. Light to moderate pollution. On the 11th, most of Hunan and Guangxi were lightly polluted, and Hubei was lightly to moderately polluted. On the 12th to 13th and 15th, Hubei was well to lightly polluted, and Hubei was lightly to moderately polluted on the 14th. pollute. The primary pollutant is O3 or PM2.5.
Southwest Region:
In the first half of February, the overall diffusion conditions in most of the southwest region were average. Most cities were mainly fine. Moderate pollution may occur in some areas during some periods. Among them, from the 1st to the 2nd, some cities in Sichuan were lightly to moderately polluted, some cities in western Guizhou and Chongqing were polluted from good to mildly polluted, and the remaining cities in the southwest region were mainly polluted with good quality; from the 3rd to the 8th, affected by cold air and precipitation , most cities in the southwest region are mainly good; from 9 to 10, some cities in Sichuan were lightly to moderately polluted, some cities in Chongqing, Guizhou, and Yunnan were good to lightly polluted, and the remaining cities in the southwest were mainly excellent; From the 11th to the 15th, some cities in Sichuan were lightly to moderately polluted, Chongqing was classified as good to lightly polluted, and the rest of the cities in the southwest region were mainly fine. The primary pollutant is PM2.5.
Northwest Region:
In the first half of February, the air quality in most of the region is mainly good, with local mild pollution possible, and moderate or above pollution possible in parts of the eastern region during certain periods. Among them, from the 1st to the 4th, the central and eastern parts were affected by the cold air and rain and snow processes, and the diffusion and wet deposition conditions were favorable. The diffusion conditions in other areas were average. Most of the region was mainly good. There may be light pollution in the eastern part. Guanzhong Moderate pollution may occur locally and in western Inner Mongolia; on the 5th and 6th, the high-altitude trough will turn to weak ridge control, and the diffusion conditions will deteriorate. Most of the area is mainly good, and light pollution may occur in Guanzhong, Shaanxi. Moderate pollution may occur locally in western Inner Mongolia; from the 7th to the 8th, the pressure field weakens and diffusion conditions are poor. Most of the area is dominated by good to light pollution, and moderate pollution may occur in central and southern Shaanxi; from the 9th to the 10th, The central and eastern parts are affected by the northwest airflow after the trough, and the diffusion conditions gradually improve from west to east. The diffusion conditions in other areas are average. Most of the areas are mainly good. Mild pollution may occur locally, and light to moderate pollution may occur in central and southern Shaanxi. From the 11th to the 13th, due to the continuous influence of the northwest airflow, the diffusion conditions were relatively good; most of the area was mainly good, and slight pollution may occur locally; from the 14th to the 15th, the pressure field weakened and the diffusion conditions became worse. Most of the region is dominated by good to light pollution, and short-term moderate pollution may occur in central and southern Shaanxi. From the 1st to the 15th, the air quality in cities in northern northern Xinjiang was mainly excellent, and the northern slopes of the Tianshan Mountains were mainly lightly to moderately polluted. From the 1st, 6th to 8th, and 12th to 14th, moderate to severe pollution may occur, and the air quality in eastern Xinjiang was mainly Good to light pollution is the main type. South Xinjiang is mainly light to moderate pollution on the 1st, 6th-8th and 12th-14th. The rest of the time is mainly good to light pollution. The primary pollutants are PM10 and PM2.5.