The youngest study participant, 7yo, had the highest CO2 levels at 25,000 ppm–12.5x the safe limit of 2,000 ppm.
Study: https://jamanetwork.com/journals/jamapediatrics/fullarticle/2781743
Graph: https://twitter.com/FatEmperor/status/1410564906257207303?s=20
![](https://i0.wp.com/brightlightnews.com/wp-content/uploads/2021/07/masks-jama-study-co2-levels-6x-safe-limit-in-masked-children.jpg?fit=789%2C1024&ssl=1)