If airborne transmission is a significant factor in the pandemic, especially in crowded spaces with poor ventilation, the consequences for containment will be significant. Masks may be needed indoors, even in socially-distant settings. Health care workers may need N95 masks that filter out even the smallest respiratory droplets as they care for coronavirus patients.
Ventilation systems in schools, nursing homes, residences and businesses may need to minimize recirculating air and add powerful new filters. Ultraviolet lights may be needed to kill viral particles floating in tiny droplets indoors.
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Outside in the sun in the summer time coronavirus tends to die but inside there is nothing to kill the virus and so people get infected from droplets hanging in the air over time.
So, it is the indoor groups of people that is where most of the new cases come from nationwide. So, if people gather inside without masks on and only 1 person is contagious it could theoretically spread to all people within any inside area given a certain amount of time. So, let's say within an hour or two all people in any one location without masks on might get coronavirus. But, this also doesn't mean that people wearing masks are completely safe indoors either if they are in groups of people.
So, you might need an M95 mask if you work indoors. And to make matters even worse nurses and doctors wearing M95 masks also have gotten the coronavirus while working in hospitals and many have already died this way worldwide.
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