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How far did oxygen levels fall inside Biosphere 2 after 17 months?
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Biosphere 2
Biosphere 2, located in Oracle, Arizona, U.S., shown in 2008. The facility was originally developed to study survivability and assess whether humans were capable of building and living in self-sustaining colonies in outer space. It was later used as a scientific research facility.
At the start of the first mission in Biosphere 2, the indoor atmosphere contained approximately 20.9 percent oxygen. After 17 months, those levels had dropped to 14.2 percent.1