LAUSR

Air quality has increasingly been a great concern all over the world, and the good command of indoor and outdoor air qualities is of benefit to the air pollution alleviation by various measures. In this work, the indoor and outdoor particle concentration distributions of a typical meeting room during the haze and clear-sky days were measured. The results show that the mass concentrations of the indoor and outdoor PM1, PM2.5, PM10 in heavy haze days are 114±1.8, 135.5±3.2, 161.7±12.8 μg/m3 and 146.4±8.4, 192.3±10.2, 431.4±34.8 μg/m3 respectively, corresponding to 39.3±1.5, 58.5±2.5, 127.9±10.5 μg/m3 and 54.5±4.0, 77.8±6.0, 173.4±21.6 μg/m3 in clear-sky days. Both in the haze and clear-sky days, the number distribution of particles reaches its peak value at the diameter of 0.25 μm, but the particle number concentration in the haze day is two times greater than the clear-sky day. The indoor particle concentration is not uniform with the peak value at the corner, which can be effectively alleviated by the air cleaner. The in-situ measurements of particle concentrations in a meeting room are helpful for the indoor air quality control.