A CO2 chart showing two distinct peaks; one at 3500 ppm and one at 2700 ppm.
https://cdn.masto.host/tootyoshis/media_attachments/files/112/152/024/218/972/044/original/fdccd5a617a09537.jpeg
Again: if you’re on an airplane, you should be wearing a high-filtration mask. It’s sound practice for the entire flight, but especially before takeoff and after landing.
Here are the CO2 measurements from a flight I took yesterday - the two peaks are from embarking and disembarking, showing the plane’s ventilation systems being shut off. This is unfortunately a frequent practice.
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