Affected by a Mongolian cyclone and strong winds from a cold front, a large-scale sandstorm, blowing sand, and dust weather occurred in central and western Inner Mongolia to northwestern Hebei on the night of the 14th, with visibility around 1 kilometer, and locally less than 300 meters. Affected by upstream sand and dust transport, the PM10 concentration in our city increased significantly on the 15th, and our city experienced a sandstorm. On the afternoon of the 16th, the southwestern part of our city was affected by sand and dust backflow.

　　In response to this strong wind and sandstorm weather, the Beijing Meteorological Observatory issued a blue alert for strong winds and a blue alert for sand and dust at 5:15 PM and 5:20 PM on the 14th, respectively, and upgraded to a yellow alert for sandstorms at 7:25 AM on the 15th.

　　Today, affected by the southerly wind, sand and dust backflow may occur, and the PM10 concentration may increase for a short time. According to monitoring data, the PM10 concentration in the six central districts is 57 micrograms per cubic meter, 50 micrograms per cubic meter in the northwest; 15 micrograms per cubic meter in the northeast; 46 micrograms per cubic meter in the southeast; and 172 micrograms per cubic meter in the southwest. Air quality in most parts of the city remains at good levels, while air quality in Fangshan District has reached a moderate pollution level.

　　According to the forecast, it is expected that the regional wind will shift to southerly winds from the afternoon to night, and the risk and degree of sand and dust backflow will decrease. However, from the current perspective, it is expected that the air quality at some sites during some periods from afternoon to night may still reach a moderate pollution level of 3-4.