CO2 scrubbers exist. They're commonly used by deep water divers and as part of anaesthesia equipment in hospitals. If you're happy to do DIY stuff, I'm sure

CO2 scrubbers exist. They're commonly used by deep water divers and as part of anaesthesia equipment in hospitals. If you're happy to do DIY stuff, I'm sure you could buy some and hook it up in your house. Some things to beware of: * CO2 scrubbers can turn some not-very-dangerous pollutants into highly toxic compounds. There are various papers suggesting that they seriously impact the mental health of people undergoing surgery for example. * You need a lot of CO2 scrubbing to have any impact. Unless you need a wheelbarrow when you're changing the filters each week, your filter is probably too small for a typical house.