| Summary: | Plants have the potential to reduce CO<sub>2</sub> concentration, but their photosynthesis is directly influenced by the indoor lighting environment. As a result, the efficiency of indoor plants is limited by indoor lighting environment. In order to explore the effect of lighting environments on the reduction of indoor CO<sub>2</sub> concentration by indoor plants, three representative lighting environments were constructed, including a natural lighting environment, a poor lighting environment and an all-day lighting environment, while five common plants were selected to be planted in five transparent sealed chambers. Experimental results show that the lighting environment affected the CO<sub>2</sub> concentration largely in transparent sealed chambers. Compared to the transparent sealed chamber without plants, the highest and average CO<sub>2</sub> concentrations were increased by from 47.9% to 160.9% and from 21.6% to 132.4% in the poor lighting environment, respectively, while they decreased by from 60.4% to 84.6% and from 71.4% to 89.7% in the all-day lighting environment. This indicated that plants did not purify the indoor air consistently. Among the selected plants, the most suitable houseplant was <i>Scindapsus aureus</i>, followed by <i>Chlorophytum comosum</i> and <i>Bambusa multiplex</i>.
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