Spot on. I watched a doctor give a talk on the effects of masks and the CO2 levels, and a lot of people could very well feel these effects, mild hypoxia or even full blown hypoxia depending on your own sats levels. The N95 mask with the face seal and one way filter (so if you are a carrier and don't know it you are breathing out the virus as it's on filtered on the inhale) only stops virus droplets down to 0.3 micron, the approx size of the Chinese flu starts at 0.16 micron!  Even the mask makers website they won't protect you from the chinese virus.