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*How do I isolate my voice so that I don't de-disguise myself? How to communicate with others?
*How do I isolate my voice so that I don't de-disguise myself? How to communicate with others?
*Either face protection or respiratory protection, but not both at once;
*Either face protection or respiratory protection, but not both at once;
*Conventional respirators are available but rarely used (they are difficult to breathe in, and don't use high air pressure);
*Conventional respirators are available but rarely used (they are difficult to breathe in, and don't use CPAP, continuous positive airway pressure);
*Respiratory protection is inadequate (it doesn't protect against viruses and some toxic aerosols);
*Respiratory protection is inadequate (it doesn't protect against viruses and some toxic aerosols);
*In the event of a sudden need, most people will not realize in time to put on a respirator;
*In the event of a sudden need, most people will not realize in time to put on a respirator;