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I edited my question after doing some research. I also edited the question to include phrase "out of door". When indoors the risk is increased considerable with stale air or air that has been circulated from another area that may have the virus. I edited the question to be more specific although it may still need improvement. I am also not sure of the tags.

The measles can be transmitted up to 30 meters and remain airborne up to 2 hours thus far COVID-19 remains I believe an open issue.

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    There have been lots of studies done. Did your research not find any?
    – Graham Chiu
    Commented Apr 24, 2020 at 0:57
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    According to this March 2020 article, "no studies have directly evaluated the biophysics of droplets and gas cloud formation for patients infected with the SARS-CoV-2 virus". But the author, MIT Prof Lydia Bourouiba, says exhalations can cause gaseous clouds that travel up to 27 feet.
    – unutbu
    Commented Apr 24, 2020 at 2:00
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    @unutbu You could turn that comment into a good answer.
    – Carey Gregory ♦
    Commented Apr 24, 2020 at 3:51
  • @CareyGregory May I know why did you rejected my suggested edit to this post?
    – I likeThatMeow
    Commented Apr 24, 2020 at 14:42
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    @America The breathing and research tags are so broad as to be worthless and adding a dash to COVID19 seemed trivial. If you want to re-edit, I'll approve if you just leave out breathing and research.
    – Carey Gregory ♦
    Commented Apr 24, 2020 at 18:03

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According to this March 2020 article, "no studies have directly evaluated the biophysics of droplets and gas cloud formation for patients infected with the SARS-CoV-2 virus". But the author, MIT Prof Lydia Bourouiba, says exhalations can cause gaseous clouds that travel up to 27 feet.

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    Good answer, but gaseous clouds and particle-containing clouds are different things. There are lots of studies in progress, and they are alarming. Viral particles remain suspended in the air after invasive procedures for hours (depending on the study, two to four hours), and a forceful cough can propel smaller droplets - virus-laden droplets - up to 15 feet.
    – anongoodnurse
    Commented Apr 25, 2020 at 2:31

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