This is a mask without a respirator that in less than 5 minutes kills and neutralizes 99.9% of bacteria and viruses. It is an excellent solution for air pathogens, harmful bacteria, and pollution. In addition, Mask N95 is reusable. You should rinse in hot soapy water for 2 hours. In case you wear a nonreusable mask, discard it when it is hard to breathe through it.