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schiffern
27 days ago
CO2 on the ISS routinely gets up to 5 mmHg = 6,500 ppm, because the CO2 scrubber is more effective at that concentration. According to NASA it's "not practical from a hardware standpoint" to set the operational CO2 limit at 4,000 ppm.
https://ntrs.nasa.gov/api/citations/20100039645/downloads/20...