Interesting. Is there a link to the study? I am curious about where it was done (indoor or outdoor, at what temp, and at what exertion level). I tend to do fine indoors with ac for short periods of time, but in heat, add sweat, and exertion.. I find myself needing to tear that mask off and get relief just breathing with it off (I do mask breaks away from others). I am curious if these conditions (time, heat/humidity, exertion level) can be lab replicated and studied in others? (Or if they...

There was no link with the press release or the post info. But this is the JACI article - https://www.jacionline.org/article/S0091-6749 (20)31785-1/fulltext