Well. If it is 'aerosol' that spreads coronavirus, then we should have worn face masks thousands and thousands of years ago. How did we as humans ever survive? It's an absolute miracle we haven't become extinct. No? And isn't it amazing that our mammalian friends somehow survived? Wait. Does disease spread by 'aerosols' in animals? No? Tell me this isn't so. According to the CDC, they should all be dying. OMG!! Why aren't animals wearing face masks? Sarcasm set aside here. Aerosol is a very poor vector for the transmission of disease. Notwithstanding, it is manifestly true people get sick more often being indoors. This is why the winter months is the season for colds and flu. There's obvious reasons for this that I won't address here.  There is however very SIMPLE solutions to all of this. Being outdoors allows exposure to UV light. UV light is very effective in killing pathogens such as Covid-19. Being outside is the best ventilation system there is. If you are going to be inside don't worry about other peoples aerosols. Our ancestors really didn't know much about ventilation systems and they survived just fine. Their bio-individual immune systems did all the work for free. If we listen to the CDC and WHO, you would think that we are all defective disease bearing herd-like animals with weak and ineffective immune systems. This is of course a LIE and couldn't be farther from the truth. Our immune system is far superior than any vaccine ever created. And vaccines do NOT help the immune system. It does the opposite and cripples it. In fact, the average individual has tens of millions of pathogen strains (viruses, bacteria, parasites) already in their bodies. As an example, everyone has the pneumonia virus already residing in them. Everyone has stapphyloccus in them too. You may have tuberculosis bacterium that has been completely isolated and check-mated. It is your immune system that keeps these pathogens under control and suppressed. And it does a mighty damn good job of it too.  Trump mentioned using UV light to kill pathogens. This can be used indoors in lighting. It's an incredibly simple solution and can be used in conjunction with ever-improving ventilation systems. So, if you are in a building with poor ventilation, yea, maybe you are at a higher risk than someone in a well ventilated building. However, if you are healthy and exercise, your immune system is light-years better than someone else that has preconditions from years of smoking and drinking alcohol.