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J.Health Sci., 48(6), 480-484, 2002
Mutagenicity of Suspended Particulate Matter Divided in Three Sizes Indoors
Yukihiko Takagi,a Sumio Goto,b Daisuke Nakajima,*, b Osamu Endo,c Michiko Koyano,c Ken-ichi Kohzaki,a and Hidetsuru Matsushitad
aSchool of Veterinary Medicine, Azabu University, 1-17-71 Fuchinobe, Sagamihara, Kanagawa 229-8501, Japan, bResearch Center for Material Cycles and Waste Management, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan, cDepartment of Community Environmental Sciences, National Institute of Public Health, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8638, Japan, and dShizuoka Institute of Environment and Hygiene, 4-27-2 Kitaando, Shizuoka, Shizuoka 420-8637, Japan
To clarify indoor air pollution, indoor and outdoor air samples were collected from 22houses in Tokyo using a low-volume cascade impactor with a quartz fiber filter. Suspended particulate matter (SPM) was classified into three sizes:  10 mu m, 2.5-10 mu m and  2.5 mu m. The mutagenic compounds were extracted by the dichloromethane/sonication method. The solution was concentrated by N2 gas. Mutagenicity was determined by the microsuspension method, employing the Salmonella typhimurium (S. typhimurium) YG 1024 strain in the presence and absence of S9 mix. The samples showed generally higher mutagenicity in the absence of S9 mix than in its presence. Outdoor air tended to have higher or similar mutagenicity to indoor air. The smallest SPM ( 2.5 mu m) fraction showed the highest mutagenicity (revertants/m3· air). These results suggest that one of the main sources of high mutagenic SPM indoors is air entering from outdoors.
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