On February 25, according to the forecast of the Gansu Provincial Environmental Monitoring Center Station, this week (February 26 and March 3), the high-altitude trough activity is frequent, and there will be short-term sand and dust weather in Hexi and central Gansu Province, and the pollution diffusion conditions in other areas of Gansu Province are average, and the ambient air quality is good to slightly polluted.
Specifically, on February 26, the central area of Hexi was affected by the high-altitude shortwave trough, the ground wind speed increased, and there was a short-term sand and dust weather, and the ambient air quality deteriorated to moderate to severe pollution in some periods, and the pollution diffusion conditions in other parts of the province were average, and the daily ambient air quality of the province was good to slightly polluted.
On February 27th and 28th, the province was controlled by the westerly airflow at high altitude, and the pollution diffusion conditions were average, and the ambient air quality of the province was good to slightly polluted.
On February 29, the high-altitude trough gradually moved eastward, and under the influence of the high-altitude trough and cold air, a large-scale sand and dust weather process occurred in the province, and the ambient air quality in Hexi and central areas was mild to moderately polluted, and the rest of the province was benign to mildly polluted.
On March 1, the high-altitude trough continued to move eastward and southward, and the ambient air quality of the province remained good to slightly polluted.
On March 2, the province gradually switched to high-altitude ridge area control, and the ambient air quality in Hexi and central areas was good to slightly polluted, and the rest of the province was excellent.
On March 3, the Hexi area was affected by the high-altitude trough, the wind speed increased in a short time, and there was a dust weather, and the rest of the province was controlled by the high-altitude northwest airflow, and the pollution diffusion conditions were general, and the ambient air quality of the province was good to slightly polluted.
On February 26 and March 3, the top pollutants in the province were PM10 and PM25。
*: Gansu Traffic Broadcasting.
Editor: Chen Shiyun.