I'd second the Airthings device, they have pretty high quality sensors and include VOCs, CO2, pm2.5, radon, and a few others. A little bit pricey is the only do

I'd second the Airthings device, they have pretty high quality sensors and include VOCs, CO2, pm2.5, radon, and a few others. A little bit pricey is the only downside for me.