...
Looks like it may be a risk in some cirumstances, especially indoors
However, main spread is still when people are within 1.5 m
https://www.cnbc.com/2020/08/03/fauci-says-theres-a-degree-the-coronavirus-is-spreading-through-air-particles.html
Fauci, during the interview with JAMA,
said it has become “much clearer” that someone is likely at greater risk if they’re in an indoor space where there’s less air circulation
and “any degree of aerosolization.”
Some experts who have studied aerosolization have indicated there are larger particles discharged when someone coughs or sneezes that might float in the air longer than previously thought
“We need to pay a little bit more attention now to the recirculation of air indoors,
which tells you that mask-wearing indoors when you’re in a situation like that is something that is as important as wearing masks when you’re outside dealing with individuals who you don’t know where they came from or who they are,”
https://www.smithsonianmag.com/science-nature/what-scientists-know-about-airborne-transmission-new-coronavirus-180975547/
Over the past few months, an increasing number of scientists, clinicians, and engineers have called for greater recognition that
aerosols, in addition to larger droplets can transmit the novel coronavirus that causes COVID-19.
While the difference is literally miniscule, acknowledging this route of transmission would result in significant changes in how the public can bring an end to the global pandemic.
In the near term, it would inform social distancing and mask wearing recommendations from local governments,
and in the long term, engineers and architects will need to rethink ventilation and air filtration in the design of everything from schools to cruise ships