期刊
JOURNAL OF ALLERGY AND CLINICAL IMMUNOLOGY
卷 148, 期 3, 页码 771-+出版社
MOSBY-ELSEVIER
DOI: 10.1016/j.jaci.2021.02.030
关键词
Fine particulate matter; PM1; early-life exposure; asthma; wheezing; preschool children
资金
- Scientific Research Program - Hubei Provincial Department of Education [Q20201104]
- Outstanding Young and Middle-Aged Technology Innovation Team Project of Hubei Provincial Department of Education [T2020003]
- Open Fund Project of Hubei Province Key Laboratory of Occupational Hazard Identification and Control [OHIC2020Y01]
- Key Research Center for Humanities and Social Sciences in Hubei Province (Hubei University of Medicine) [2020ZD001]
The study found that early-life exposure to size-specific particulate matter, particularly during pregnancy, was significantly associated with an increased risk of childhood asthma, but no clear association with wheezing was observed. Short breastfeeding duration may exacerbate the risk of childhood asthma associated with particulate matter exposure.
Background: Emerging research suggested an association of early-life particulate air pollution exposure with development of asthma in childhood. However, the potentially differential effects of submicron particulate matter (PM; PM with aerodynamic diameter <= 1 mm [PM1]) remain largely unknown. Objective: This study primarily aimed to investigate associations of childhood asthma and wheezing with in utero and first-year exposures to size-specific particles. Methods: We conducted a large cross-sectional survey among 5788 preschool children aged 3 to 5 years in central China. In utero and first-year exposures to ambient PM1, PM with aerodynamic diameter less than or equal to 2.5 mu m, and PM with aerodynamic diameter less than or equal to 10 mu m at 1 x 1-km resolution were assessed using machine learning- based spatiotemporal models. A time-to-event analysis was performed to examine associations between residential PM exposures and childhood onset of asthma and wheezing. Results: Early-life size-specific PM exposures, particularly during pregnancy, were significantly associated with increased risk of asthma, whereas no evident PM-wheezing associations were observed. Each 10-mu g/m(3) increase in in utero and first-year PM1 exposure was accordingly associated with an asthma's hazard ratio in childhood of 1.618 (95% CI, 1.159-2.258; P = .005) and 1.543 (0.822-2.896; P = .177). Subgroup analyses suggest that short breast-feeding duration may aggravate PM associated risk of childhood asthma. Each 10-mu g/m(3) increase in in utero exposure to PM1, for instance, was associated with a hazard ratio of 2.260 (1.393-3.666) among children with 0 to 5 months' breast-feeding and 1.156 (0.721-1.853) among those longer breast-fed. Conclusions: Our study added comparative evidence for increased risk of childhood asthma in relation to early-life PM exposures, highlighting stronger associations with ambient PM1 than with PM with aerodynamic diameter less than or equal to 2.5 mu m and PM with aerodynamic diameter less than or equal to 10 mu m.
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