<i>Effect of interior plants for CO</i>_<em>2</em><i> concentration, indoor air temperature and relative humidity in office buildings</i>

This experimental study investigates the influence of indoor plants on three aspects of air quality in office spaces: relative humidity, indoor air temperature, and carbon dioxide concentration. Employing a Latin square design, we rotated three different treatments across three offices over six time periods. These treatments included a control (no plants), a low volume treatment (five plants), and a high volume treatment (eighteen plants) of <i>Nephrolepis exaltata</i> (Boston fern). Air quality parameters were continuously monitored at five-minute intervals using Trace Gas Analyzers. Generalised linear mixed modelling (GLMM) was employed to examine the effect of each treatments on relative humidity, indoor air temperature and CO₂ concentration. We found a significant positive association between the number of indoor plants and relative humidity. Median levels of relative humidity increased from 29.1% in offices with no plants to 38.9% and 49.2% in offices with 5 and 18 plants respectively. However, we did not find significant associations between the number of indoor plants and indoor air temperature or corrected CO₂concentration. Our research provides support for the use of indoor plants to increase relative humidity, which can have health benefits in dry climates, but does not provide support for using indoor plants to regulate indoor air temperatures nor CO₂ concentration in office environments.本实验研究探讨了室内植物对办公空间空气质量三项核心指标的影响：相对湿度、室内空气温度与二氧化碳浓度。本研究采用拉丁方设计（Latin square design），在六个时间段内于三间办公室间轮换三种实验处理方式。三种处理方式分别为对照组（无植物）、低量处理组（5株植物）与高量处理组（18株植物），所用植物为波士顿蕨（*Nephrolepis exaltata*）。空气质量参数采用痕量气体分析仪（Trace Gas Analyzers）以每5分钟为间隔进行连续监测。本研究采用广义线性混合模型（Generalised linear mixed modelling, GLMM），分析各处理方式对相对湿度、室内空气温度与二氧化碳浓度的影响。研究结果显示，室内植物数量与相对湿度之间存在显著正相关关系。相对湿度的中位数水平从无植物办公环境的29.1%，分别提升至种植5株与18株植物办公环境的38.9%与49.2%。然而，本研究未发现室内植物数量与室内空气温度或校正后二氧化碳浓度存在显著关联。本研究证实，室内植物可用于提升办公环境相对湿度，这在干燥气候条件下对人体健康具有积极益处；但未发现室内植物能够调节办公环境内的室内空气温度或二氧化碳浓度。