Ao Air facewear cleans the air of pathogens and pollutants using proprietary nanofibers. Their lightweight, battery-powered facewear “engineers” the air using a fan to create positive air pressure behind a shield, protecting the user without requiring a seal. The mask protects the user from 99.75% of 0.25 micron (250nm) particulates / pathogens. There is an option for customizable filtration that allows for combatting specific threats. Compared to a market leading N95 mask, they are 44-67% cooler, 20-41% less humid and have 60-90% less CO2 inside the breathing area. They have working prototypes, and are aiming to have scaled production ready in the next 2-3 months. Ao Air was formerly known as O2 O2.