Ventilation is crucial, but until recently it took a backseat to other covid measures

For more than two years, scientists and researchers have known the coronavirus often infects people through ultra-tiny particles that hang out in the air — not just the bigger droplets that masks are supposed to protect against.

But it wasn’t until March that the White House pivoted its strategy to stress ventilation measures, in addition to face coverings, as a primary method of slowing the spread of the virus. It’s a prime example of how, throughout the pandemic, federal agencies have been slow to fold the latest scientific findings into their policy recommendations. But the science behind how the virus spreads has also fluctuated, particularly in the early days of the pandemic when so much was unknown. 

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