A full face mask would be very dangerous in the city. One needs all their peripheral vision to avoid pedestrians and cross traffic and anything that interferes is dangerous and this includes many types of sunglasses that have thick side arms that block the view of the wearer.
More important is to learn defensive riding as a cyclist in traffic and to be as visible as possible. God knows why but few city cyclists bother to wear a bright yellow or green jacket or a bright helmet and don't seem to care about being seen by motorists who are driving along with multiple distractions and not looking out for people on bicycles.