OSHA generally recommends that employers encourage workers to wear medical masks or cloth face coverings at work to help prevent the spread of the coronavirus. OSHA recently issued frequently asked questions (FAQ) guidance to address inaccurate claims that these masks and face coverings cause unsafe oxygen or harmful carbon dioxide levels for the wearer. Get the facts here: https://www.osha.gov/SLTC/covid-19/covid-19-faq.html#cloth-face-coverings