What weather phenomenon is floating dust?

Floating dust is a weather phenomenon that a lot of fine sand and dust float in the air and turn the sky into khaki.

Dust and fine sand float evenly in the air, making the horizontal visibility less than 10000 meters, and floating dust is mostly spread by dust in the distance through high-altitude airflow; Or it is formed by fine particles floating in the air after sandstorm and sand blowing, which is very harmful to human lungs. According to the previous explanation of the meteorological department, the difference between sandstorms and floating dust or sand blowing lies in visibility, and sandstorms are only considered when the visibility is less than 1 km.

Floating dust is a kind of dusty weather, which mostly occurs in spring and is divided into three grades: floating dust, sand blowing and sandstorm. Floating dust is the weakest kind of dusty weather. Appears when there is no wind or wind before and after the cold air passes through. It means that dust and fine sand float evenly in the air, mostly from distant dust diffused by high-altitude airflow, or from fine particles that have not sunk after dust storms and sand blowing, and the vertical visibility is also poor.

Commonly known as "falling yellow sand", when it appears, the distant objects are khaki, the sun is pale or yellowish, and the visibility is less than 10 km and more than 1 km, and there is basically no obvious wind.

cause

Floating dust in dust refers to suspended particles with a diameter less than 10 micron, which can float in the air for a long time. This is the most common pollutant in the air. Usually, we call it particulate pollutants. Most of these particulate pollutants are caused by human activities, such as black smoke, white smoke, red smoke and yellow smoke. Floating over some industrial cities. The combustion of coal and fossil fuels releases a large number of particles suspended in the air, which seriously pollutes the atmosphere.

About 500 million tons of particulate matter are discharged into the air every year in the world. These floating dust pollutants mainly come from fuel combustion and industrial waste gas. It is estimated that for every 1 ton of cement produced, 6.5 kilograms of floating dust will be discharged.