Here are some facts about what plants would actually do to your air:
1. Some plants actually emit VOCs, as can soil. So it’s possible that VOCs went up because of the plants!
2. The Chinese team claimed to be testing formaldehyde, but these detectors aren’t that specific. That means it’s possible that these plants were decreasing a harmful VOC like benzene and increasing some non-harmful VOC.
3. There is some decent evidence that the effect on VOCs depends a lot on the plant type. These researchers specifically chose plants that people claim are effective, but the results could be different with other plants.
4. These plants had no detectable effect on particulate pollution indoors.
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