Gas was released by the Apollo Lunar Modules during depressurization of the cabin in preparation to an EVA.

Did this release of oxygen had a measurable effect despite the small amount of gas and the huge space of a very good vacuum around the landing spot?

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    $\begingroup$ the engine was more of a contribution. I have a factoid in my head, but can't substantiate it, that the lunar atmospheric density doubled taking about three months t return to normal. $\endgroup$ – user20636 Jul 29 '19 at 14:01
  • $\begingroup$ @JCRM but during the descent there was nothing to measure a gas concentration at the landing spot. So maybe the ascent engine was more of a contribution. $\endgroup$ – Uwe Jul 29 '19 at 14:05
  • $\begingroup$ Possibly related: what does burnt Az50 smell like? As far as I know, I'm the only person who takes the "who smelt it, dealt it" hypothesis seriously. $\endgroup$ – Russell Borogove Jul 29 '19 at 14:36
  • $\begingroup$ Oh, sorry, didn't realise this was a question you already had an answer for. $\endgroup$ – user20636 Jul 29 '19 at 14:40
  • $\begingroup$ @JCRM I appreciate other answers to my question, not only my own. $\endgroup$ – Uwe Jul 29 '19 at 14:43

The ALSEP experiment of Apollo 14 measured such a release of oxygen before opening the hatch for the second and third time.

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