Any resources you could share here? I bought a Rabbit air filter years ago and it seems like it does fine. But since I did something similar to the OP here and started tracking my Awair air quality monitor in real time, I’ve noticed we have wild VOC levels in our roomy house and I can’t sort out what causes spikes, especially overnight. Some of it is probably due to the insulating and weather stripping mania I went through a while back and I’ve looked into getting an exhaust fan (whatever those things are called) to alleviate it but would like to know the source(s).