[jdsnape]

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”

[bustermellotron]

You could use air scrubbers https://en.wikipedia.org/wiki/Soda_lime