In the early part of May, the northern atmospheric diffusion conditions were generally mild and moderate in Beijing, Tianjin and Hebei.

category:Global
 In the early part of May, the northern atmospheric diffusion conditions were generally mild and moderate in Beijing, Tianjin and Hebei.


(1) Beijing, Tianjin, Hebei and surrounding areas: 5 in the first half of the month, atmospheric diffusion conditions are generally in general. On the 3 day, under the influence of the northwest cold air, the atmospheric diffusion conditions were good. Most of the regions were from good to light pollution, and the primary pollutants were PM10 and O3. On the 4~5 day, the central and southern regions of the region were affected by the inversion of temperature and systematic south wind, and the atmospheric diffusion conditions were slightly worse. The main areas of the region were mainly mild to mild pollution, and the middle part of the region was mainly light to moderate pollution, and the primary pollutants were PM2.5 and O3. On the 6~7 day, under the influence of cold air, the atmospheric diffusion conditions were improved. Most of the regions were from good to light pollution, and the primary pollutants were PM10 and O3. The air quality level of some cities may be increased by 1 to 2 on the basis of the existing forecast. On the 8~12 day, the atmospheric diffusion conditions gradually changed, most of the regions were mainly from good to light pollution, and some cities in the central and southern parts of the region might have moderate pollution. Beijing: in May 3rd, the air quality was good, and the primary pollutant was PM2.5. On the 4 day, air quality is light to medium pollution, and the primary pollutant is PM2.5. On the 5 day, the air quality was light pollution, and the primary pollutant was PM2.5. On the 6 day, the air quality is good, and the primary pollutant is PM2.5. On the 7 day, the air quality was good to light pollution. The main pollutants were PM2.5 and O3. On the 8 day, the air quality was light pollution, and the main pollutants were PM2.5 and O3. On the 9 day, air quality was good to light pollution, and the primary pollutant was PM2.5. On the 10~11 day, the air quality was good, and the primary pollutant was PM2.5. On the 12 day, the air quality was good to light pollution. The main pollutants were PM2.5 and O3. (two) northeast China: in the first ten days of 5, the general condition of atmospheric diffusion is generally, and the possibility of heavy pollution in a wide range is relatively small. Among them, the 3 day, the region is affected by the northwest air flow, the atmosphere diffusion condition is good, the area of the area of air quality is mainly good, some area may appear mild pollution, the primary pollutant is PM2.5, PM10 or O3. 4~5 days, the regional atmospheric diffusion conditions are general, the main area of the region air quality is good to mild pollution, the western Liaoning may have moderate pollution, the primary pollutant is PM2.5, PM10 or O3. On the 6 day, the conditions of regional atmospheric diffusion were improved, and the quality of the air in the large part of the region was mainly good, and there might be some mild pollution in the region. The primary pollutants were PM2.5, PM10 or O3. On 7~11 day, the regional ground gradually turned to the southwest wind, and the atmospheric diffusion conditions were general. The air quality in the large part of the region was mainly to mild pollution. Moderate pollution may occur in the Midwest of Liaoning. The primary pollutants were PM2.5, PM10 or O3. On the 12~15 day, the regional atmospheric diffusion conditions improved. Most of the air quality in the region was mainly from good to light pollution, and the primary pollutants were PM10 or O3. (four) Southern China region: in the first 5 months of the month, the overall air quality in the region is mainly excellent to good. Slight pollution may occur in some parts of central Hubei and Hunan. In 3~4 days, the large area of the region is affected by the eastward flow and precipitation process, the wet settlement clearance conditions are favorable, the air quality is excellent, and the local area of Hubei and Hunan is slightly polluted. On 5~7 day, the coastal provinces were affected by the strong southward air flow, the atmosphere diffusion conditions were favorable, the large part of Hubei was affected by the rainfall, the wet cleaning conditions were favorable, the air quality in the large part of the region was fine, and the local pollution in Fujian and Hunan was mild. On the day of 8~10, affected by weak cold air and small-scale precipitation process, atmospheric dispersion and wet deposition clearance conditions are favorable, and regional air quality is mainly fine. On the day of 11~16, atmospheric dispersion conditions are generally good. Most of the air quality in most parts of the region is good, and most of them are located in central Hubei, Hunan and Guangdong. During the period, the main pollutants in the region were mainly PM2.5 or PM10. (five) southwest region: most of the air quality is mainly in the middle of 5. Affected by high temperature and little cloud, there is a O3 pollution process in the Sichuan basin from late to early middle. On the 3~4 day, the temperature in the Sichuan basin was higher, and the O3 and PM2.5 in some cities were slightly polluted. 5~7 days, affected by weak cold air, most of Sichuan basin, Chongqing and Guizhou have regional precipitation, and the regional air quality is excellent. On 8~11 day, the temperature rebounded, the main area of the region is mainly to good, the Sichuan basin part, Chongqing and Yunnan local cities are O3 mild pollution, and the local cities of the Sichuan basin are moderate pollution. On the 12~15 day, the temperature in the Sichuan basin was relatively high, and the local O3 was slightly polluted in most parts of the basin, Chongqing, Guizhou and Yunnan. (six) northwest region: most of the region is mainly from good to light pollution in the first 5 months of the month. Severe and severe pollution may occur in the southern part of Xinjiang in the south of Xinjiang. In 3~4 days, the middle and western regions of the region are affected by the northern air flow, and the wind speed is strong near the ground. In the southern Xinjiang region of Xinjiang, the east of Gansu and the Hexi region and the part of Ningxia, the sand or floating dust weather may appear in some parts of the southern Xinjiang basin. The air quality in the other regions is good to mild pollution. Lord. On 5~8 day, there may be precipitation weather in most regions of the region. The condition of wet settlement clearance is more favorable. The air quality of the large part of the region is mainly good, and the local area is mild pollution. The impact of sand dust in southern Xinjiang may appear short time severe and above pollution. On 9~14 day, the general and vertical diffusion conditions of the atmospheric horizontal diffusion in the region are favorable, and the air quality in the large part of the region is dominated by mild to mild pollution, and the impact of sand dust in southern Xinjiang may be short time severe and above pollution. On the 15 day, the wind speed in the middle and western regions of the region is large, and the sand or dust weather may occur. The eastern region is affected by the convergence of the cold and warm air flow, the precipitation may occur, the wet settlement clearance conditions are favorable, the main area of the region is mainly to mild pollution, and the impact of sand dust in southern Xinjiang may appear short time severe and above pollution. Source: Ministry of ecology, responsible editor: Huang Zhecheng _B9302 (six) northwest region: most of the region is mainly from good to light pollution in the first 5 months of the month. Severe and severe pollution may occur in the southern part of Xinjiang in the south of Xinjiang. In 3~4 days, the middle and western regions of the region are affected by the northern air flow, and the wind speed is strong near the ground. In the southern Xinjiang region of Xinjiang, the east of Gansu and the Hexi region and the part of Ningxia, the sand or floating dust weather may appear in some parts of the southern Xinjiang basin. The air quality in the other regions is good to mild pollution. Lord. On 5~8 day, there may be precipitation weather in most regions of the region. The condition of wet settlement clearance is more favorable. The air quality of the large part of the region is mainly good, and the local area is mild pollution. The impact of sand dust in southern Xinjiang may appear short time severe and above pollution. On 9~14 day, the general and vertical diffusion conditions of the atmospheric horizontal diffusion in the region are favorable, and the air quality in the large part of the region is dominated by mild to mild pollution, and the impact of sand dust in southern Xinjiang may be short time severe and above pollution. On the 15 day, the wind speed in the middle and western regions of the region is large, and the sand or dust weather may occur. The eastern region is affected by the convergence of the cold and warm air flow, the precipitation may occur, the wet settlement clearance conditions are favorable, the main area of the region is mainly to mild pollution, and the impact of sand dust in southern Xinjiang may appear short time severe and above pollution.