Almost all portable oxygen concentrators emit noise levels below 50 decibels, so they'll always be quieter than at-home units. The quietest portable oxygen concentrator is the CAIRE FreeStyle Comfort, which registers at a barely-audible 38 decibels.

0:02 Intro to Noise Levels
0:29 Quietest Portable Concentrators
1:10 CAIRE Comfort Noise Level
1:28 Inogen One G4 Noise Level
1:32 Inogen One G5 Noise Level
1:40 Additional Concentrator Noise Levels

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