> These seem like crazy differences. Some classrooms have over 6x the CO2 concentration that others. 6x seems plausible just because some classrooms are more c

> These seem like crazy differences. Some classrooms have over 6x the CO2 concentration that others. 6x seems plausible just because some classrooms are more crowded than others, and kids are probably breathing harder at the start of class, during first class, during first class after lunch or breaks or P.E… “The variation in CO2 levels inside classrooms that we observe in our sample is almost fully caused by indoor sources, i.e. human breathing, with negligible variation from outdoor levels.” I wonder if peak rates could be easily misinterpreted? This chart doesn’t say how long peaks last or when they happen. Did they verify that a single sensor is a good proxy for distribution of CO2 in the room? It depends on where the sensor is located, for example. Near the door will see higher peaks as people come in and out than in the far corner, and air might flow toward the door. Looking at the average tells a more meaningful story, but even that may need more context, right?