长时间漂浮在大气中，可通过呼吸进入呼吸道的颗粒物（其空气动力学直径小于10微米）inhalable particulate matter

• 污染指数晴天在25左右徘徊，污染指数雨天在10左右徘徊，属主要可吸入颗粒物，空气质量级别为I级。

  On a clear day the pollution index hovers around 25, and on a rainy day it hovers around 10, which is mainly inhalable particulate matter, with air quality at Level I.

• 城市施工工地“扬尘”，是指上述工程施工过程中产生的对大气造成污染的悬浮颗粒物和可吸入颗粒物。

  "dust" from city construction sites refers to suspended particles and inhalable particulate matter causing atmospheric pollution that is generated during the construction of the aforementioned projects.