filtered air

例句：

1. 1. The hospital uses filtered air to keep the patients comfortable.
   医院使用过滤空气来让病人感到舒适。
2. 2.The filter in the air conditioner removes pollutants from the room.
   空调中的过滤器从房间中移除污染物。
3. 3. Air pollution is a major concern for many cities, as it can affect the quality of their filtered air.
   空气污染是许多城市的主要关切，因为它会影响他们过滤后的空气质量。