Poynter: Another air quality monitor demonstration fails to show masks reduce oxygen to children

Poynter: Another air quality monitor demonstration fails to show masks reduce oxygen to children. “The air we breathe is made up of about 78% nitrogen by volume, 21% oxygen and much smaller amounts of argon, carbon dioxide, hydrogen and other gases. In the video, the man apparently alludes to the federal Occupational Safety and Health Administration, which regulates workplaces. OSHA defines an atmosphere that is less than 19.5% oxygen as oxygen-deficient, and potentially unsafe. So the reference to ‘19.5 parts per million’ in the video misstates the safety threshold. That unit of measurement is typically used to describe the concentration of chemical contaminants in water or soil, or trace amounts of a gas; 19.5 ppm is not a plausible reading of oxygen concentration in the atmosphere at a school board meeting.”

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