Now to address the whole debate about using respirators and masks. You absolutely want them. There has been a narrative throughout the western world that you don't need them, and they don't work. This is not the case. The CDC and WHO tell ordinary people to not wear respirators, but both organizations have political agendas and have frankly done a terrible job handling this public health crises. The truth is that there is a lack of respirators to go around when every single person should be wearing them. In Taiwan, their number one way to combat COVID19 is by having every single person in their population wear masks. Thus far, Tiawan has been one of the best countries in handling the COVID19 health crises.
Now to address why N95/N99/N100/NIOSH respirators work. One of the leading pathways for transmitting this disease is through inhalation of respiratory droplets from other infected individuals. An immediate barrier that has been proven to be effective is having a mask/respirator to intercept these droplets before they reach your mucus membranes. The coronavirus is between 60 to 140 nm in diameter. Let's use the N95 mask for example. This mask captures all particulates at 300 nm at a rate of up to 95% or better. 300 nm is the particulate size that has the lowest capture efficiency. Anything smaller, including the coronavirus, will have an even higher capture efficiency. This virus is one of the most contagious pathogens we have had in recent human history. Any form of personal protection equipment is absolutely vital in keeping yourself from becoming infected. I would also recommend that when you are in a public areas you should wear eye protection, gloves and over coat that you leave outside your house. I do really think the motorcycle helmet is a very creative and potentially effective way to keep yourself protected.