AQI Air Quality Index的意思|示意

There's something called the Air Quality Index, or the AQI, and it keeps track of how clean or populated the air is on a day to day basis.

空气质量指数，简称AQI，是对每天空气清洁或污染的情况进行追踪记录。

Air quality Index (AQI) measures the overall quality of the air on a scale of 0 to 500. A low number means good air quality while higher Numbers means worse air quality.

空气质量指数衡量大体的空气质量，数值从0到500，数值越小说明空气质量越高，反之越低。