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You can form a simple CO2 scrubber by buying colorized bulk soda lime, putting it in a HEPA filter bag, and running air through it, but it's very expensive. It'

You can form a simple CO2 scrubber by buying colorized bulk soda lime, putting it in a HEPA filter bag, and running air through it, but it's very expensive. It'll probably cost $100 a day. Also, you'll still be on the hook for maintaining good ventilation so as to remove indoor bioeffluent VOCs. Better systems are being researched.

BizarroLand 3mo ago
You can also buy an at home oxygen concentrator for around $125 usd and try it. Iirc it uses atomic sieves that filter out anything larger than oxygen and then releases the oxygen, so it can run for a very long time without replacement. It's also fun to see how it affects things on fire. The weak little jet of air from the one I bought can turn an lit incense stick into a pillar of fire. There are likely health downsides to them for otherwise healthy people so I wouldn't suggest using them frequently for breathing purposes, but they can help with short term aerobic output and exercise if you are training at the edge of your physical capability.