Volatile and hazardous compounds are formed during the chlorination of pool water. Monitoring components in the air, such as the four trihalomethanes; chloroform, dichlorobromomethane, dibromochloromethane and bromoform (tTHM), is challenging. Carbon dioxide (CO₂) sensors are used for controlling air quality in different buildings and can be installed in ventilation systems for continuous surveillance and monitoring purposes. However, such sensors are not used in indoor swimming facilities. In this study, samples of tTHM and CO₂ were collected and analysed, along with other air and water quality parameters such as combined chlorine, to evaluate whether CO₂ sensors could be used to explain the observed variability in the tTHM concentration in an indoor swimming facility and thereby reduce the exposure of individuals utilising the pool to tTHM. Random intercept models were built for the tTHM and CO₂ concentrations, respectively, and the results show that the relationships between combined chlorine in the water, CO₂ in the air and number of occupants explain 52% of the variability in tTHM. The correlation between occupancy and CO₂ concentration (ρ = 0.65, p ≤ 0.01) suggests that CO₂ sensors should be used so that the air supply corresponds to the demand of the users.

泳池水氯化过程中形成挥发性和有害化合物。监测空气中的成分，例如四种三卤甲烷；氯仿，二氯溴甲烷，二溴氯甲烷和溴仿（tTHM）具有挑战性。二氧化碳（CO ₂）传感器用于控制不同建筑物中的空气质量，可以安装在通风系统中以进行连续监视和监视。但是，这种传感器没有在室内游泳设施中使用。在这项研究中，收集并分析了tTHM和CO ₂的样品，以及其他空气和水质参数（如联合氯气），以评估CO ₂是否传感器可用于解释室内游泳设施中所观察到的tTHM浓度的变化，从而减少使用游泳池的个体对tTHM的暴露。分别针对tTHM和CO ₂浓度建立了随机截距模型，结果表明，水中总氯，空气中CO ₂与乘员数量之间的关系解释了tTHM变异的52％。占用率与CO ₂浓度之间的相关性（ρ= 0.65，p≤0.01）表明应使用CO ₂传感器，以便空气供应符合用户需求。