Oxygen Levels To Maximum

Barley, a dog, snoozes on her huge bed with her caterpillar toy. Around here are multiple potted snake plants.
Just before the cold snap hit, I finally got around to something I’ve been meaning to do for months: buying more Sansevieria plants. The two plants I’ve had for the last couple years were getting very long in the tooth, and seemed to be doing poorly (probably some combination of their soil being depleted and lingering root rot). So I’ve repotted two of the plants into fresh soil and added three additional plants. This will hopefully up the oxygen levels in my apartment, because as the old plants got a bit worse for wear, the air in my apartment definitely felt rather more stale.