What are the warning signals of sandstorm?

Every year, from the end of winter to the end of spring, sandstorms are high season. We often see various color sandstorm weather warnings issued by the Central Meteorological Observatory. So, how many kinds of sandstorm warning signals are there? What's the difference between them? Let's take a look at the popular science of Bian Xiao Weather Network.

The warning signal of sandstorm is divided into three levels, which are represented by yellow, orange and red respectively. Understanding the meaning of different color signals and the corresponding defense measures can reduce the harm of natural disasters to human society.

Meteorology divides sandstorm weather into four categories: floating dust, sand blowing, sandstorm and strong sandstorm. Only when strong winds blow enough dust into the sky and the atmospheric visibility is less than 1 km can it be called a sandstorm. Sandstorms are seldom seen in Beijing. Sandstorm disasters will lead to human and animal deaths, building collapse and agricultural production reduction. It is no less harmful than typhoons and tornadoes. It will also cause air pollution and topsoil loss, and it will also cause many environmental problems. Humans can't stop sandstorms, but they can reduce their harm. Under normal circumstances, people's nasal cavity, lungs and other organs have a certain filtering effect on dust, but the dust storm, a disastrous weather phenomenon, brings too much and too dense fine dust, which is very likely to make people with respiratory allergic diseases relapse. The main manifestations are runny nose, tears, cough, expectoration and other irritating symptoms and allergic reactions, which can lead to skin inflammation and conjunctivitis in severe cases. Sandstorms do serious harm to the lungs. With the increase of dust particles inhaled into the lungs, dust particles will be deposited in the chest cavity, leading to lung and pleural lesions, causing bronchitis, pneumonia and other diseases.