The purpose of this study were to make clear the present condition of indoor thermal and air environment by cooling in school classrooms and to analyze the relation of the living conditions with indoor environment. The measurements on physical elements and observations on living conditions were carried out in 6 classrooms of 3 middle or high schools. Measuring elements were indoor temperature, relative humidity, PM10 and $CO_2$ concentration. As results, the averages of indoor temperature each classrooms were $24.9{sim}26.6^{circ}C$. Most of classrooms were lower than the Maintenance standard $(26{sim}28^{circ}C)$ of School Health Law. The means of relative humidity were $51.3{sim}72%$, all classrooms were ranged within the standard $(30{sim}80%)$. The means of PM10 concentration were $3.5{sim}23.1{mu}g/m^3$, all classrooms were kept within the standard $(100{mu}g/m^3)$. The means of $CO_2$ concentration were $1218.7{sim}4705.4ppm$, all classrooms were exceed the standard (1,000ppm). The results of analysis on relations of living conditions with the physical elements are as follow; the air conditioner set of temperature, windows and doors opening elapsed time, the number of students in classrooms and activities of students had certain effect on indoor environment.