This report includes 100+ links to from scientific studies on the efficacy and safety of masks, along with key excerpts.
"Chapter 1: Introduction
... Whether masks are good or bad comes down to two questions: a) are they meaningfully effective in preventing COVID-19 transmission, and b) are they safe to wear?
To answer those questions, we look to Science. This report — although scientific — is written for lay persons to be able to understand. Yes, a few parts of it are technical, but the topic is technical, so that’s unavoidable.
Science’s answer to both questions is NO. For a quick overview, just read the “Bottom Lines” at the end of each chapter, plus the Conclusion (Chapter 4), as those are written in plain English."
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