Probably what others have warned about before: that indoor air pollution can be 100 times the level of outdoor air pollution — and it can come from some pretty surprising sources. (treehugger.com)
There is a growing awareness of outdoor air quality and its impact on our health, but our indoor air is also often less healthy than it should be. (educationbusinessuk.net)
Building ventilation systems were designed to provide fresh outdoor air in the building. (druryhotels.com)