It is speculated that particles mainly come from transport and grounddust.
推测颗粒物的主要来源为交通运输和地面扬尘。
2
A strong wind of dust storms can carry heavy objects, so you should try to stay low, and close to the ground, and protect your head with your arms or a backpack.
强劲的沙尘暴可以卷起重物,所以你应该尽量保持低姿态,靠近地面,并用你的手臂或背包保护你的头部。
3
That happens when heavier particles are lifted by the wind and then fall back to the ground, hammering and shattering the dust-clumps as they do so.