Plants are nice…but, from your link:

“These results are not applicable to typical buildings, where outdoor-to-indoor air exchange already removes volatile organic compounds (VOCs) at a rate that could only be matched by the placement of 10–1000 plants/m2 of a building's floor space.[2]

The results also failed to replicate in future studies”

You’d need a forest in your room to see a proper change. There was a whole discussion in the Indie hacking scene on X on that topic around 1-2 weeks ago

Big fan of plants though, help me feel calm

Plants release CO2 at night, though. Not much, but they certainly won't help to remove it unless they are photosynthesising.