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Proposed updates to the Canadian Standards Association Z94.4 respiratory protection standard are a critical step toward protecting healthcare staff from airborne hazards, including viruses. The revisions clearly say the standard applies to healthcare (where it has been ignored historically). They require specific assessments for airborne pathogens (to determine minimum respiratory protection), and recognize the ethical obligation to apply the precautionary principle in decisions. Adoption, expected in 2026, will set a professional standard of care and avoid the mistakes of SARS-1 and the on-going COVID-19 pandemic. 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