Coronavirus whistleblower likens airborne transmission to secondhand smoke: ‘There is no such thing as a smoke-free part of a restaurant’

Of all the mysteries that remain about COVID-19, how exactly it spreads is arguably the most contentious. Both the Centers for Disease Control and Prevention and the World Health Organization assert that it’s transmitted mainly through large respiratory droplets and rarely via surfaces. But this week, in a letter to WHO, 239 scientists and environmental experts expressed concern about another, more elusive route of transmission: tiny particles in the air.

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