TL;DR: masks have not ever been and cannot be an effective control for airborne virus control. Engineering controls (air filtration/circulation and destruction) have been the solution for 80 years with good reason.
Stephen Petty:
Certified industrial hygienist;
Certified safety professional;
Professional engineer;
45 years in the field of health and safety, trying to protect workers and the public from toxins;
Named/testified in over 400 legal cases related to exposure control and personal protective equipment (PPE);
talks us comprehensively through 50 years of evidence showing the ineffectiveness of masks in mitigating SARS-Cov-2, the COVID virus.
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