The blue warning of sandstorm in the north, what level does the blue warning of sandstorm represent?

The blue warning of sandstorm in the north represents the average level, which is the lowest in the overall level.

First, the color warning level Meteorological disaster warning signals are generally divided into four levels: blue, yellow, orange and red, which respectively represent general (level IV), heavy (level III), serious (level II) and particularly serious (level I). At the same time, it has been marked in Chinese and English, which is consistent with all emergency treatment levels and colors in the country. The blue forecast signal of sandstorm specifically indicates that sandstorm weather may occur within 24 hours (visibility is less than 1500m) or sandstorm weather has appeared and may continue. The yellow warning signal of sandstorm specifically means that sandstorm weather may occur within 12 hours (visibility is less than 1000 meters) or sandstorm weather has appeared and may continue. The orange warning signal of sandstorm refers to the possibility of strong sandstorm weather (visibility less than 500 meters) within 6 hours, or the strong sandstorm weather has appeared and may continue. The specific representative of sandstorm in red warning signal is that there may be extremely strong sandstorm weather within 6 hours (visibility less than 50 meters), or it has already appeared and may continue.

Second, how did the sandstorm come about? To form sandstorms, there must be sand plains and strong airflow. It is windy in the Arctic and dusty in the Mongolian Plateau. Cold air is basically not raging in winter. Sandstorm not only has low visibility, but also has many hazards, which will wind erosion the soil on the surface, affect the growth of plants and lead to crop yield reduction. It will also greatly reduce the air quality, making it easy for people to get upper respiratory diseases.

Third, how to prevent the country from constantly building shelter forests in the north in recent years to consolidate soil and store water. The frequency of sandstorms is getting lower and lower. When encountering a sandstorm, you can cover your head with a scarf. Pedestrians who defend against sandstorms should ensure good sight, pay attention to traffic safety and ride bicycles as little as possible. When it is windy, don't stay on billboards, temporary structures and ancient trees. Drivers should pay attention to the change of sandstorm and drive carefully.