Classroom ventilation found to be bad

Teachers were asked to test air quality in classrooms around Montreal, and even leaving aside Covid, the results were not good. Do you remember feeling groggy by mid-afternoon in school? CO2 levels can get high enough in a crowded, closed classroom to do that.

This wasn’t a complete, controlled test, but a sampling. I’d be curious to know how much better the recently constructed school buildings are doing, compared to the big old brick piles still functioning as schools around town.

Update: CBC has a new science piece on how indoor air is the real risk with Covid. Washing hands and sanitizing surfaces will go on, but they’re not the key.