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>>/2697/ Somewhere in the fine print I saw allowable exposure of an average of 30,000ppm for <2 hours. I couldn't find it again, but I'm glad you saw it too because when I did I was like, wtf? Then I saw that people breath out 10-40kppm. "because human breath is approximately 3.8% CO2" [38,000ppm] So a confined space with a lot of people could achieve that.