1/ Concerns about under-ventilation of indoor spaces are FAR from new. Here are just 3 of many examples.
2/ Ben Franklin (18th century): "I am persuaded that no common Air from without, is so unwholesome as the Air within a close Room, that has been often breath'd and not changed" Franklin advocated exposure to fresh air & including open windows when sleeping.
3/ Florence Nightingale (mid 19th century): “Keep the air the patient breathes as pure as the external air, without chilling him.”
4/ Florence Nightingale: And poorly ventilated air is “stagnant, musty, and corrupt as it can by possibility be made [and] [i]t is quite ripe to breed small-pox, scarlet-fever, diphtheria, or anything else you please.”
5/ Max von Pettenkofer (mid 19th century): Recommended a maximum acceptable CO2 concentration of 0.1% (1,000 ppm).
6/ There are many more examples from 19th century and a lot during 20th century. Poorly ventilated spaces are inexcusable and unhealthy, & we can deal w/ the issue of poor outdoor air quality that enters buildings. It is not rocket science.
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