Why does Beijing dust flow back?

The dust return in Beijing is mainly due to the change from north wind to south wind, which brings back the dust of the previous day and leads to dusty weather. Another reason is that the intensity of this sandstorm is too strong, resulting in a high concentration, and there is a lot of floating dust in the air, which will hit again because of the wind direction.

Recently, Beijing suffered the strongest sandstorm weather in the past decade. There was no sunshine for a week, and then there was yellow sand everywhere, which had a great impact on people's lives. After the sandstorm, the weather turned fine, and Beijing lifted the blue warning of strong wind and the yellow warning of sandstorm. I thought the sandstorm had passed, and the next day Beijing was hit by sandstorm. On that day, affected by dust, the weather in Beijing was still yellow and the air quality was seriously polluted. The Meteorological Observatory issued a message to remind people to pay attention to travel safety. Moreover, at present, dusty weather has appeared in many parts of the country, and it has an impact in the south, Hubei, Anhui, Jiangsu and other places.

It is understood that there are two main reasons for this dust backflow. The first reason is that the dust weather in Beijing the day before was very strong, which led to a high dust concentration in the air. Large dust particles have been settled by gravity, and small dust particles cannot be completely settled in a short time. Therefore, although the sky is blue, there is actually a lot of suspended dust in the air. The second reason is that the strong north wind is weakened by the south wind, and the dust in the air is blown back, killing one in Beijing? Make a comeback? . These two reasons together caused the dusty weather in Beijing the next day.

At present, the fine particles suspended in the air are difficult to disappear in a short time, and it may take a little time, which is estimated to last until the weekend. Therefore, the air quality may be poor and the atmospheric visibility is relatively low. Everyone should try not to go out, be well protected when going out, wear masks and glasses, or you may inhale some harmful particles, try to protect your respiratory tract and eyes and pay attention to your health.