European engineers: stop recirculating air in buildings
Almost every American office building and home has this.
![European engineers: stop recirculating air in buildings](https://media.treehugger.com/assets/images/2020/04/IMG_9121.jpeg.600x315_q90_crop-smart.jpg)
![](https://media.treehugger.com/assets/images/2020/04/IMG_9121.jpeg.400x300_q70_crop-smart.jpg)
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