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Air pollution and poor indoor environmental quality is identified as the worlds largest environmental risk.The quality of air in an indoor environment where people spend a large proportion of their lives is paramount for a healthy lifestyle.Human beings spend on average 20 hours per day indoors thus making it imperative in assessing overall comfort.Recent studies have shown the presence of plants have an advantage in an indoor environment by providing physical(improvement or indoor air quality and noise reduction)and psychological benefits.This research investigated the impact of several popular and widely used indoor potted plants on relative humidity,temperature,CO2 and the removal of volatile organic compounds(VOCs).Experiments were carried out in glasshouses,controlled environmental cabinets and offices at the University of Reading Whiteknights campus; to monitor the impact of three different varieties of indoor potted plants on these parameters.All potted plants were reducing CO2 concentration levels in both the cabinets and the offices between 8pm-5am,however by doing so they were increasing relative humidity and temperature.No alarming traces of VOCs were measured in either the cabinets or the offices before the introduction of the plants; however,after the potted plants have been introduced,traces of VOCs such as isobutylene and toluene were found within the test premises of all potted plant species in both the cabinet and offices.Within the office,Ficus benjamina had an increase of 90%in VOC levels when compared to reference data.