Students spend most of their day indoors, especially in school, which makes it easy to be affected by the quality of indoor air at schools. For this reason, indoor air quality in schools is very important. Recently, schools have expanded the installation of air purifiers to help these students take care of their health. The purpose of this study is to evaluate the efficiency of indoor air control according to the type of air purifier. In this study, PM10, CO2, TVOCs, TAB, HCHO, and NO2 were measured indoors and outdoors for each day of operation of air purification systems and for each of the nine schools. The study found that air purifier showed high control effect in the order of complex, floor top, ceiling, air purifier type, air conditioner type, and air-conditioner filter type. The control effect on particulate air pollutants (PM10, TAB) was higher than that of gas-phase air pollutants.