How do experts interpret the causes of dust backflow?

The retention and backflow of dust are related to the movement characteristics of dust and the southwest airflow.

Yesterday morning, the main body of dust gradually moved out of Beijing, but because of the large scope of dust, although the main body of dust has moved out of Beijing, it has not gone too far. The wind direction in Beijing changed to southwest wind, which made the dust not go far and began to flow back to Beijing.

The construction of general shelterbelt is mainly used to protect local dust. For the long-distance dust transported at high altitude in the Mongolian sand source area, the transmission height reaches hundreds or even thousands of meters, and the protective effect of the shelter forest on this dust is limited.

Extended data:

Precautions:

Wear a mask to reduce the damage of sandstorm to respiratory tract. Dust storms can cause floating dust, inhalable particles and fine particles at the same time. It is recommended to wear N95 and above protective masks.

Wear goggles to avoid eye damage caused by wind and sand. If the wind and sand enter your eyes, don't rub them with your hands. Rinse with running water or drop eye drops as soon as possible. If you still feel uncomfortable, see a doctor in time.

Wear a hat, scarf and other dust-proof appliances, and wrap your head with a scarf to avoid the damage of sandstorm to your skin, hair and ears. Wash your hands and face immediately after coming out, rinse your mouth with clear water, clean your nose, take a shower if possible, change clothes in time, and keep your body clean and comfortable.

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