Niels-Jakob Hansen, Rui C. Mano, 02 September 2021

The emergence of new Covid-19 variants and a highly uneven vaccine rollout have put mask mandates back on the policy agenda. This column presents new evidence that state-level mask mandates reduced new weekly COVID-19 cases, hospital admissions, and deaths significantly in the US. The results imply that 87,000 lives were saved up until 19 December 2020, while an additional 58,000 lives could have been saved if all states had put in place a mandate starting in April 2020. Mask mandates had a greater effect in counties more positively inclined towards mask wearing.

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