The infographic is based on ACGIH's Pandemic Response Task Force[1]. The list of references for respirator/mask information is available on their site[2]. I can

The infographic is based on ACGIH's Pandemic Response Task Force[1]. The list of references for respirator/mask information is available on their site[2]. I can't speak to the veracity of the evidence provided, but there is evidence. [1]: https://www.acgih.org/covid19/ https://www.acgih.org/covid19/ [2]: https://www.acgih.org/covid19-references/#resp https://www.acgih.org/covid19-references/#resp