free air facility

例句：

1. 1.The free air facility is designed to improve the indoor air quality.
   这个自由空气设施旨在改善室内空气质量。
2. 2. The hospital has installed several free air facilities in its lobby.
   医院在其大厅安装了多个自由空气设施。
3. 3.The new policy aims to encourage people to use public transportation and reduce their reliance on private cars, which can lead to higher levels of pollution in urban areas.
   新政策旨在鼓励人们使用公共交通工具，减少对私家车的依赖，这可能导致城市地区的污染水平升高。