According to @ChinaWeather: When the sky turns yellow and there is dust floating in the air, is it really a sandstorm? Actually, not all sandstorms are sandstorms. Only when the dust weather reaches a certain intensity, it can be called a dust storm. In meteorology, according to the impact from mild to severe, sand and dust weather can be divided into floating dust, blowing sand, sand and dust storms, strong sand and dust storms and extremely strong sand and dust storms. Therefore, the so-called Chengdu sandstorm is floating dust rather than sandstorm.

@成都氣象: Chengdu also began to be affected by the floating dust weather during the day today, and it is expected that the floating dust weather will last until 29, during which it is recommended that the general public wear dust masks or goggles when going out.

Source: China News Network