Exposure assessment on the relationship between daily activity patterns and indoor air quality in university buildings

초록

This study analyzed the impact of the spatial-temporal distribution of occupants on indoor air quality. To observe daily building usage by students, Dongnam Health University with about 5,000 students and staffs was selected as the survey site, and the survey was conducted on 500 students (10%) as a sample to represent the activities all students. The students’ activities were surveyed and classified into seven categories (work, study, exercise, circle, recreation, others, and trip) to know how long they stayed in the space between 6 a.m. to 24 p.m. Based on the survey results, an hourly activity behavior profile of students in each building was obtained in the statistical model. While the survey was conducted, PM10 concentration and CO2 concentration were measured using a dust spectrometer (Grimm Inc., model 1.108) and IAQ monitor (Senscube Inc.), respectively, inside eight buildings on the campus. The indoor PM10 concentration was found to be more affected by outdoor concentration rather than the number of occupants while indoor CO2 concentration was found to be affected more by the number of occupants. This study was the first attempt to apply the spatial-temporal distribution of occupants for managing indoor air quality using a statistical model and is intended to propose a new method for managing indoor air quality.