How much ventilation makes a Manitoba school safe? Experts say it's a moving target

Manitoba's provincial government has given guidance on ways to improve air quality in schools during the fourth wave of the COVID-19 pandemic, but experts say our understanding of what is needed to clean the air students and staff breathe continues to evolve.

"There's no doubt that ventilation plays a role in reducing exposure," said Bill Bahnfleth, a professor of architectural engineering at Pennsylvania State University who researches interior quality with a focus on bio-aerosol control. 

"Exactly how much ventilation is enough to reduce it to a practical limit — this is somewhat unclear."

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