The agency had advised people to ventilate indoor air before, but this is the first time a federal agency has set a target – five air changes per hour – for how much rooms and buildings should be ventilated.
Air quality experts cheered the updated recommendations. “It’s a monumental shift. We haven’t had this. We haven’t had health-based ventilation standards,” said Joseph Allen, director of the Harvard Healthy Buildings Program. Allen says that although it’s easy to see the guidance only in the context of Covid-19, it will help with many other airborne hazards like wildfire smoke, allergens and other infectious diseases, such as the flu.
“If they had broadcast and implemented these changes at the beginning, there never would have been a pandemic,” Prather said. The new CDC guidance was developed in conjunction with a new standard from the American Society of Heating Refrigeration and Air Conditioning Engineers. The CDC says better indoor ventilation can reduce the concentration of viral particles in the air, lowering the risk that a person would breathe them in and get sick.
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