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The concentrations of HCHO(formaldehyde), (particulate matter), (carbon dioxide) and TBC(total bacteria counter) distribution in schools(Chung-Nam Area) were examined, and the results were compared with the recommended criterion of the administration law of indoor air. The subjects were an elementary school, a middle school and a high school in Chung-Nam area, and the concentration of TBC was examined by Single Stage Air Cascade Sampler, which applied the inertia collision catching method of 28.29L/min(flux) during 5 months from March, 2007 to July, 2007. The instrument(LD-3B, SIBATA Company)was used to examine , by a light scattering method and a light transmission method. The instrument(Airboxx(KD Engineering) was used to examine . The instrument(Z300XP(Environmental sensor)was used to examine HCHO. The result indicated that the average concentrations of the surveyed classrooms were in Spring and in Summer. The average concentration of the surveyed schools were 576 ppm in the classroom and 527 ppm in the stateroom. The average concentration of TBC were in an elementary school, in a middle school, in a high school. The HCHO average concentration of the surveyed schools were 0.03 ppm in the classroom, 0.02 ppm in the stateroom.
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