Radon short-lived decay products generated from the earth is one of the serious indoor air pollutantsin Europe and US. We measured natural radioactive substance and main indoor air pollutants in thefacilities of Sapporo and Nagoya City. The main measured items were composed of 1) air temperature,2) air humidity, 3) CO2, 4) CO, 5) HCHO, 6) VOCs, 7) airborne fungi,8) airborne bacteria, 9) SPM and10) Rn and Rn-Dts. The subjected spaces were laboratories, lecture rooms, libraries, museums, publicunderground spaces, closed spaces without window and outdoors.
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