China News Service, March 16. According to the website of the Ministry of Ecology and Environment, on March 15, 2024, the China Environmental Monitoring Station, in conjunction with the Central Meteorological Observatory, the National Joint Center for Atmospheric Pollution Prevention and Control, the Northeast, South China, Southwest, Northwest, and Yangtze River Delta regional air The Quality Forecasting Center and the Beijing Ecological Environment Monitoring Center will conduct a national air quality forecast consultation in the second half of March 2024 (March 16-March 31).
In the second half of March, the air quality in most of the northern, northeastern, southern and southwestern regions of Beijing-Tianjin-Hebei and surrounding areas was mainly excellent, while the air quality in the remaining areas was mainly good to lightly polluted.
Among them, due to the early impact of sand and dust transmission, moderate or above pollution may occur in the Beijing-Tianjin-Hebei region, parts of Henan, most of the Fenwei Plain, and most of the northwest region.
During some periods in the mid-term, the northwest region and the Fenwei Plain are expected to be affected by sand and dust transmission again, and moderate or above pollution may occur.
Cities in eastern and southern Xinjiang are affected by sand and dust weather, and moderate to severe pollution may occur during certain periods.
Beijing-Tianjin-Hebei and surrounding areas: In the second half of March, the northern part of the region was mainly fine, and the central and southern parts were mainly good to lightly polluted. In some periods, short-term moderate or above levels of pollution may occur.
Among them, on the 16th, the high altitude was controlled by the uniform pressure field, the surface wind field gradually weakened, the wind direction was southerly, the boundary layer height was low, and the diffusion conditions were relatively unfavorable. The northern part was fine, the central and southern parts were dominated by light to moderate pollution, and the central part was Short-term severe pollution may occur in the city; affected by the dust process that may occur upstream from afternoon to night, PM10 may experience short-term severe or above-level pollution in parts of Beijing-Tianjin-Hebei and Henan; from 17 to 22, affected by the transit of high-altitude troughs, the spread Conditions have improved significantly, mostly good, with local good to light pollution in the central part; affected by strong northwest winds, there may be a risk of sand and dust transit during the period; from the 23rd to the 25th, the high altitude will shift from high pressure bottom control to uniform pressure field control, and the ground The wind speed is strong, the pressure gradient is weak, and there is less local accumulation in the early stage. The northern part is fine, and the central and southern parts are mainly good to lightly polluted. From the 26th to the 31st, regional atmospheric diffusion conditions are average, and the temperature rebounds slightly. The northern part is fine, and the central and southern parts are mainly good to lightly polluted. Mainly good to light pollution.
The primary pollutants are mainly PM2.5 or PM10.
Beijing: In the second half of March, the temperature continues to be warm and the diffusion conditions are unfavorable. It is expected that three air pollution processes will occur on the 16th, 22-24th and 29-31st. On the 16th-17th, cold air will carry sand and dust. The transit period may cause PM10 in Beijing to exceed the standard, but the air quality during the rest of the period is excellent.
Among them, on the 16th, controlled by low pressure, the mid-level temperature increased and the wind turned southerly, and the high altitude entered the ridge area. The diffusion conditions were poor, and light to moderate pollution processes were expected to occur; from the 17th to the 21st, affected by cold air, the northerly wind was more frequent and the diffusion The conditions are generally favorable, and the air quality is expected to be mainly excellent. From the 22nd to the 24th, controlled by the low pressure field and the weak air pressure field, the conditions are stable, the humidity is high, the wind speed is low, and the diffusion conditions are relatively unfavorable, and a mild pollution process is expected to occur; 25 -On the 28th, due to the influence of cold air, the diffusion conditions will become favorable, and the air quality is expected to improve and maintain an excellent level; from the 29th to the 31st, the diffusion conditions will be unfavorable, and a pollution process may occur again.
The primary pollutant is PM2.5.
Yangtze River Delta region: In the second half of March, most of the region was mainly polluted, and the northern part was mainly polluted from good to lightly polluted. In some periods, short-term moderate pollution may occur.
Among them, on the 16th, the Yangtze River Delta was located at the back of high pressure and turned into a low pressure trough. There was precipitation in the south, and the overall quality was mainly good, while the northern part was lightly polluted. On the 17th, affected by the cold air, the north was good to lightly polluted, and it could be polluted in the short term. It reached moderate pollution, with mainly good pollution in the central and southern parts; on the 18th, the central and northern parts were controlled by a weak air pressure field, and the southern part was affected by a low pressure trough, with precipitation, and the overall pollution was mainly good; from the 19th to the 20th, affected by weak cold air, the central and southern parts of the country were mainly polluted. The northern part is partially lightly polluted, and can reach moderate pollution in a short time, and the southern part is mainly fine; from the 21st to the 24th, it is located at the rear of the high pressure and is affected by the low pressure trough, and the overall pollution is mainly fine, and the northern part is lightly polluted; from the 25th to the 26th , affected by cold air, there was good to light pollution in the north, and mainly good pollution in the central and southern parts; from the 27th to the 28th, controlled by high pressure, there was good to light pollution in the central and northern parts, and mainly good pollution in the south; from the 29th to the 31st, due to cold weather The air quality ranges from good to slightly polluted in the north and mainly good in the central and southern parts.
The primary pollutant is PM2.5 or PM10.
Fenwei Plain: In the second half of March, the overall air quality in the region is mainly good to lightly polluted. There may be two weather events of blowing sand or floating dust on the 16th-18th and 24-25th.
Among them, from the 16th to the 18th, due to the impact of upstream sand and dust transmission, blowing sand or floating dust may occur in most areas.
On the 16th, most of the air quality in the region was dominated by moderate pollution, with severe pollution possible in some periods; on the 17th, it was dominated by light pollution, with moderate pollution possible in some periods; on the 18th, it was mainly good to light pollution, with some Moderate pollution may occur during this period; on the 19th, controlled by cold high pressure, the diffusion conditions are favorable, most of the area is mainly good, and light pollution may occur in some places; on the 20th-23rd, affected by the rear part of the high pressure, diffusion conditions are average, Most of the region is dominated by good to light pollution; on the 24th and 25th, due to the impact of upstream sand and dust transmission, most of the region may experience blowing sand or floating dust weather again; on the 24th, most of the region is dominated by moderate pollution, with local Severe pollution may occur, and the impact of sand and dust gradually weakens on the 25th. Most cities are mainly lightly polluted, and moderate pollution may occur locally. From the 27th to the 31st, there is no obvious cold air activity, and the diffusion conditions are generally average. Most of the region Mainly good, slight pollution may occur locally.
The primary pollutants are mainly PM2.5 and PM10.
Northeastern region: In the second half of March, the air quality in most of the region was mainly excellent.
It is expected that three pollution processes may occur: on the 16th, affected by sand and dust weather, southern and eastern Heilongjiang, central Jilin, eastern Inner Mongolia, and most of Liaoning were dominated by good to light pollution; from 22nd to 24th, affected by southwest airflow, Jilin The central and western parts of Inner Mongolia, eastern Inner Mongolia, and most of Liaoning were mainly polluted with good to light pollution; on the 30th and 31st, affected by the warm ridge, the central and western parts of Jilin and central and western Liaoning were mainly polluted with good to light pollution.
The primary pollutant is PM2.5 or PM10.
South China region: In the second half of March, the overall atmospheric diffusion conditions in the region were good, and the air quality was mainly excellent.
Among them, from the 16th to the 17th, the central and eastern parts of Hubei and eastern Guangdong were mainly polluted with good to light pollution; on the 18th, most of Hubei was mainly polluted with good to light pollution; from the 19th to the 21st, the central and eastern parts of Hubei and western Hubei, and northern Hunan were mainly polluted. Mainly good to light pollution.
The primary pollutant is PM2.5 or O3.
Southwest Region: In the second half of March, the overall diffusion conditions in most of the region were average. There was one PM2.5 pollution process and one O3 pollution process in the Sichuan and Chongqing regions, and there was one PM2.5 pollution process and one O3 pollution process in individual cities in Guizhou. During the process, there were two O3 pollution processes in Yunnan, and the overall pollution was mainly mild, while the rest of the southwest region was mainly fine.
Among them, there is a slight risk of pollution in Chongqing, Chengdu Plain, southern Sichuan, and southwestern Yunnan on the 16th; on the 17th, there is a slight risk of pollution in some cities in Chongqing and southwestern Yunnan; on the 18th, there is a slight risk of pollution in southern Guizhou and southwestern Yunnan; on the 22nd —On the 24th, there is a slight risk of pollution in Chongqing, the Chengdu Plain, southern Sichuan, northeastern Sichuan, and western Guizhou; from the 25th to the 27th, some cities in southwestern Yunnan are at risk of mild pollution; from the 28th to the 30th, some cities in southeastern and southwestern Yunnan are at risk. Mild pollution risk; On the 31st, some cities in southwestern Yunnan had mild pollution risks.
The primary pollutant is PM2.5 or O3.
Northwest region: In the second half of March, the air quality in most of the region is mainly good, and some areas may experience mild pollution. There may be two sand and dust weather processes on the 16th-18th and 23-25th.
Among them, from the 16th to the 18th, due to the influence of cold air, blowing sand or dust may occur in Gansu, Ningxia, western Inner Mongolia, Shaanxi and northern Shanxi.
On the 16th, the air quality in most of the region was mainly good to lightly polluted. Moderate pollution may occur in Gansu and northern Shanxi, and severe pollution may occur in Ningxia and central and northern Shaanxi during some periods. On the 17th and 18th, most of the region's air quality was good to light. Mainly pollution, moderate pollution may occur locally during some periods; on the 19th and 20th, the pressure field weakened and diffusion conditions deteriorated.
Most of the area is mainly good, and slight pollution may occur locally; on the 21st and 22nd, the diffusion conditions are average.
The air quality in most of the region is mainly good, and light pollution may occur locally; from the 23rd to the 25th, affected by strong cold air, a large-scale sand and dust weather may occur in the region from west to east.
Most of the region is dominated by good to light pollution. Sand-dust-affected areas such as western Inner Mongolia, most of Qinghai, central and southern Ningxia, central and northern Shaanxi, and northern Shanxi may experience moderate or above pollution; on the 26th, the cold air continued Impact, diffusion conditions are good, most of the area is mainly good, and light pollution may occur locally; from 27th to 31st, the pressure field weakens, diffusion conditions are average, most of the area is mainly good, and local areas in the east may have pollution Mild contamination.
The primary pollutants are PM10 and PM2.5.
Xinjiang: From the 16th to the 31st, the urban air quality in northern northern Xinjiang and the northern slope of the Tianshan Mountains was excellent; the urban air quality in eastern Xinjiang was mainly good to slightly polluted, with sand and dust affecting local areas from the 16th to the 17th and the 23rd to the 24th. Moderate to severe pollution may occur; the urban air quality in southern Xinjiang is dominated by light to moderate pollution. On the 16th-17th and 23rd-26th, due to the influence of sand and dust, moderate to severe pollution may occur.
The primary pollutants are PM10 and PM2.5.