They didn't clean the air. Their methods were to inject air of different concentrations.
As stated in the article, the best approach to cleaning CO2 and VOCs is increasing the flow of outside air into closed spaces. The headline involving the word "cleaning" is misleading since it should not be your first choice unless outside air quality is poor.
As stated in the article, the best approach to cleaning CO2 and VOCs is increasing the flow of outside air into closed spaces. The headline involving the word "cleaning" is misleading since it should not be your first choice unless outside air quality is poor.