Air quality investigation and research for various types of student-oriented indoor environments on a university campus

Abstract

This study investigated suspended particles (PM2.5 and PM10), formaldehyde, TVOC, ozone, carbon dioxide, and carbon monoxide in seven student-oriented indoor environments, which are inclusive of the library study room (A), computer classroom (B), teacher and student compound office (C), classroom-1 (D), classroom-2 (E), student cafeteria (F), and underground motorcycle parking lot (G) on a university campus. We monitored each indoor environment during the open hours for at least three weekdays. The averaged concentrations of CO2 in environments A, B, C, and D all exceeded the standard (1000 ppm) with values of 2,628±375, 1,908±613, 1,752±495, and 1,076±280 ppm. The corresponding minimum and maximum CO2 concentrations were 1,101 and 3,314, 836 and 3,272, 672 and 2,667, and 752 and 2,040 ppm, respectively. Sites A, B, C, D, F, and G are the environments where the concentrations of TVOC exceeded the standard (560 ppb) with the averaged values of 829±21, 920±192, 582±8, 607±15, 640±102 and 815±205 ppb, respectively. Both concentrations of PM2.5 and PM10 in site F exceeded the standards (i.e., 35 μg/m3 and 75 μg/m3) with averaged values of 39±13 μg/m3 and 103±51 μg/m3, respectively. Three target compounds, CO, O3, and HCHO, were below their respective standards.