“Masks probably cut transmission risk by 90% for a 15-minute grocery store foray.”
Evidence? ANY?!
Asymptomatic people cause less than 1% of transmissions. And who spends 30 minutes in close proximity to someone in a grocery store? And that assumes a mask can actually DO something!
Masks catch the globs that would fall to the ground anyways. They have no effect on aerosols, although they direct the flow of air up past the eyes instead of down toward the ground.
” although they direct the flow of air up past the eyes instead of down toward the ground.”
Which allows the aerosol to linger for a longer period of time at eye level...
Something these graphics rarely show is the path of inhalation with a mask -— right past the eyes.
What happens when the aerosolized bacteria lands in the eyes?
I am going to test how much better breathing through the nose is for handling the distribution of particles. My theory is that nose breathing - or masking mouth only - will be far superior to masking both mouth and nose. The velocity and trajectory of the particles expelled through the nose should, with the help of gravity, eliminate the ‘droplets’ and aerosol much more quickly.
And I used to make fun of people who wore masks under there noses back in May...