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Though NASA and Roscosmos both say the crews are in no immediate danger, alarms on ISS have indicated an issue with the oxygen levels on the station.
“The crew and the space station are in no immediate danger and are continuing normal operations,” the spokesperson said. “The overall atmosphere inside the station remains will below the O2 concentration limits. Teams are working to identify the root cause of the issue,” he added.
This report states that the problem is “the high oxygen content in the air in the Russian Zvezda module.”
If the problem was a drop in atmospheric pressure, the issue would likely be more serious, and suggest a repeat of the 2018 leak caused by a hole drilled in a Soyuz capsule. That the problem instead is high oxygen levels, suggests something more benign.