Field-Measurement of CO 2 Level in General Hospital Wards in Nanjing

Hospital indoor air quality (IAQ) has a significant impact on patients’ and health care workers’ health and the indoor carbon dioxide (CO2) level is considered to be an indicator to evaluate IAQ in some cases. This article presents a long-term field-measurement of indoor CO2 level in a general hospital ward in Nanjing. Four months’ data are collected and analyzed to reveal variation rule of CO2 levels in wards in this periods. The results indicate that the variation rule of indoor CO2 level is associated to patients’ living habit. The use of natural ventilation is capable to keep the indoor CO2 level below 1000ppm in transition season while it is much higher in heating season due to closing openings to maintain thermal comfort. The results also demonstrate a “ω” shape of changing of CO2 levels within a day in heating season.