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Environ Res

Title:		"Indoor air quality of 5,000 households and its determinants. Part A: Particulate matter (PM(2.5) and PM(10-2.5)) concentrations in the Japan Environment and Children's Study"
Author(s):		Nishihama Y; Jung CR; Nakayama SF; Tamura K; Isobe T; Michikawa T; Iwai-Shimada M; Kobayashi Y; Sekiyama M; Taniguchi Y; Yamazaki S; Japan E; Children's Study G;
Address:		"Japan Environment and Children's Study Programme Office, Health and Environmental Risk Division, National Institute for Environmental Studies, Tsukuba, Japan. Japan Environment and Children's Study Programme Office, Health and Environmental Risk Division, National Institute for Environmental Studies, Tsukuba, Japan; Department of Public Health, College of Public Health, China Medical University, Taichung, Taiwan. Japan Environment and Children's Study Programme Office, Health and Environmental Risk Division, National Institute for Environmental Studies, Tsukuba, Japan. Electronic address: fabre@nies.go.jp. Japan Environment and Children's Study Programme Office, Health and Environmental Risk Division, National Institute for Environmental Studies, Tsukuba, Japan; Department of Environmental and Occupational Health, School of Medicine, Toho University, Tokyo, Japan"
Journal Title:		Environ Res
Year:		2021
Volume:		20210430
Issue:
Page Number:		111196 -
DOI:		10.1016/j.envres.2021.111196
ISSN/ISBN:		1096-0953 (Electronic) 0013-9351 (Linking)
Abstract:		"Exposure to particulate matter (PM) is one of the important risk factors for morbidity and mortality. Although PM concentrations have been assessed using air quality monitoring stations or modelling, few studies have measured indoor PM in large-scale birth cohorts. The Japan Environment and Children's Study (JECS) measured indoor and outdoor air quality in approximately 5000 households when the participating children were aged 1.5 and 3 years. PM was collected using portable pumps for 7 days (total of 24 h), inside and outside each home. Prediction models for indoor PM concentrations were built using data collected at age 1.5 years and post-validated against data collected at age 3 years. Median indoor/outdoor PM(2.5) and PM(10-2.5) concentrations at age 1.5 years [3 years] were 12.9/12.7 [12.5/11.3] mug/m(3) and 5.0/6.3 [5.1/6.1] mug/m(3), respectively. Random forest regression analysis found that the major predictors of indoor PM(2.5) were indoor PM(10-2.5), outdoor PM(2.5), indoor smoking, observable smoke and indoor/outdoor temperature. Indoor PM(2.5), outdoor PM(10-2.5), indoor humidity and opening room windows were important predictors of indoor PM(10-2.5) concentrations. Indoor benzene, acetaldehyde, ozone and nitrogen dioxide concentrations were also found to predict indoor PM(2.5) and PM(10-2.5) concentrations, possibly due to the formation of secondary organic aerosols. These findings demonstrate the importance of reducing outdoor PM concentrations, avoiding indoor smoking, using air cleaner in applicable and diminishing sources of VOCs that could form secondary organic aerosols, and the resulting models can be used to predict indoor PM concentrations for the rest of the JECS cohort"
Keywords:		"*Air Pollutants/analysis *Air Pollution/analysis *Air Pollution, Indoor/analysis Child Child, Preschool Environmental Monitoring Humans Infant Japan Particle Size Particulate Matter/analysis Birth cohort Household characteristics Indoor air Particulate ma;"
Notes:		"MedlineNishihama, Yukiko Jung, Chau-Ren Nakayama, Shoji F Tamura, Kenji Isobe, Tomohiko Michikawa, Takehiro Iwai-Shimada, Miyuki Kobayashi, Yayoi Sekiyama, Makiko Taniguchi, Yu Yamazaki, Shin eng Research Support, Non-U.S. Gov't Netherlands 2021/05/04 Environ Res. 2021 Jul; 198:111196. doi: 10.1016/j.envres.2021.111196. Epub 2021 Apr 30"