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Open AccessArticle

Effects of the Use of Air Purifier on Indoor Environment and Respiratory System among Healthy Adults

1
Department of Public Health, Hyogo College of Medicine, Nishinomiya 663-8501, Japan
2
Center for Health and Environmental Risk Research, National Institute for Environmental Studies, Tsukuba 305-8506, Japan
3
Hyogo Regional Center of Japan Environment and Children’s Study, Hyogo College of Medicine, Nishinomiya 663-8501, Japan
*
Author to whom correspondence should be addressed.
Int. J. Environ. Res. Public Health 2020, 17(10), 3687; https://doi.org/10.3390/ijerph17103687
Received: 28 April 2020 / Revised: 15 May 2020 / Accepted: 19 May 2020 / Published: 23 May 2020
(This article belongs to the Section Environmental Health)
Air purifiers have become popular among ordinary families. However, it remains controversial whether indoor air purification improves the respiratory health of healthy adults. A randomized crossover intervention study was conducted with 32 healthy individuals. The subjects were categorized into two groups. One group continuously used true air purifiers, and the other followed with sham air purifiers for 4 weeks. Following this first intervention, all the subjects underwent a 4-week washout period and continued with the second 4-week intervention with the alternate air purifiers. We collected fine particulate matter (PM) ≤ 2.5 µm in aerodynamic diameter (PM2.5), coarse particulate matter between 2.5 and 10 µm in aerodynamic diameter (PM10–2.5) and ozone (O3). The subjects’ pulmonary function and fractional exhaled nitric oxide (FeNO) were measured during the study period. The indoor PM2.5 concentrations decreased by 11% with the true air purifiers compared to those with sham air purifiers. However, this decrease was not significant (p = 0.08). The air purification did not significantly improve the pulmonary function of the study subjects. In contrast, an increase in the indoor PM10–2.5 and O3 concentration led to a significant decrease in the forced expiratory volume in one second (FEV1.0)/forced vital capacity (FVC) and maximal mid-expiratory flow (MMEF), respectively. In conclusion, air purification slightly improved the indoor PM2.5 concentrations in ordinary homes but had no demonstrable impact on improving health. View Full-Text
Keywords: air purifier; indoor environment; particulate matter; pulmonary function; fractional exhaled nitric oxide air purifier; indoor environment; particulate matter; pulmonary function; fractional exhaled nitric oxide
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Yoda, Y.; Tamura, K.; Adachi, S.; Otani, N.; Nakayama, S.F.; Shima, M. Effects of the Use of Air Purifier on Indoor Environment and Respiratory System among Healthy Adults. Int. J. Environ. Res. Public Health 2020, 17, 3687.

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