Indoor and outdoor concentration of PM10, PM2.5 and PM1 in residential building and evaluation of negative air ions (NAIs) in indoor PM removal

The present work was conducted in a two-part study. In part I, the levels of indoor and outdoor PM 10 , PM 2.5 , and PM 1 was measured using real time GRIMM dust monitors. In part II, the performance of NAIs method was investigated on reduction of indoor concentration of PM in these residential buildings for the first time. Hourly average concentration and standard deviation (SD) of PM 10 in indoor and outdoor at residential buildings were 63.5 ± 27.4 and 90.1 ± 33.5 µg/m 3 , respectively. Indoor and outdoor concentrations of PM 2.5 in residential buildings were 39.4 ± 18.1 and 49.5 ± 18.2 µg/m 3 and for PM 1 the concentrations were 4.3 ± 7.7 and 6.5 ± 10.1 µg/m 3 , respectively. We estimated that nearly 71.47% of PM 10 , 79.86% of PM 2.5 and of 61.25% of PM 1 in indoor of residential buildings can be removed by negative air ions.