What does the yellow warning signal of sandstorm mean?

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.

2 yellow warning signal

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meaning

Sandstorm weather may occur within 24 hours (visibility is less than1000m) or it has already appeared and may continue.

National defense guide

1. Prepare for wind and sand prevention and close the doors and windows in time;

4. Pay attention to carrying dust-proof articles such as masks and scarves to avoid dust damage to eyes and respiratory tract; Do a good job of sealing up precision instruments;

3. Reinforce structures that are easily blown by the wind, such as hoardings, scaffolding and temporary structures, and properly arrange outdoor items that are easily affected by sandstorms.

3 orange warning signal

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meaning

/kloc-Strong sandstorm weather (visibility less than 500m) may occur within 0/2 hours, or it has already occurred and may continue.

National defense guide

1. Pedestrians who cover their heads with scarves to defend against sandstorms should ensure good sight and pay attention to traffic safety;

2. Pay attention to cycling as little as possible, and don't stay on billboards, temporary structures and ancient trees when it is windy; Drivers should pay attention to the changes of sandstorms and drive carefully;

3. Pay attention to the traffic safety of airports, expressway and ferry terminals;

3. All kinds of motor vehicles should take effective measures to ensure safety;

5. Other sandstorm yellow warning signals.

4 red warning signal

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meaning

special strong dust storm red warning signal

There may be extremely strong sandstorm weather (visibility less than 50 meters) within 6 hours, or extremely strong sandstorm has already occurred.

sandstorm red warning signal

sandstorm red warning signal

The weather may not last.