ultrafine dust

例句：

1. 1. The ultrafine dust in the air can cause respiratory problems for people with asthma.
   空气中的超细粉尘会导致哮喘患者呼吸问题。
2. 2. The factory was closed due to the ultrafine dust causing health issues.
   由于超细粉尘导致健康问题，工厂被关闭了。
3. 3.The engineers were tasked with cleaning up the ultrafine dust that had settled on the equipment.
   工程师们被指派清理设备上积累的超细粉尘。