1. Pulmonary Benefits of Intervention with Air Cleaner among Schoolchildren in Beijing: A Randomized Double-Blind Crossover Study
- Author
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Ming Zhang, Jun Wang, Xiaoyan Yang, Bin Dong, Qin Wang, Chong Wang, Hongjie Ruan, Hong Zhi, Bo Wen, Dongqun Xu, Li Li, Shaoping Zhang, Jian Kong, and Feng Han
- Subjects
Male ,medicine.medical_specialty ,Air cleaner ,Double blind ,Beijing ,Air Pollution ,Internal medicine ,Humans ,Environmental Chemistry ,Medicine ,Exhaled breath condensate ,Child ,Lung ,Cumulative effect ,Air filter ,Air Pollutants ,Cross-Over Studies ,Interleukin-6 ,business.industry ,General Chemistry ,Crossover study ,respiratory tract diseases ,Boarding school ,Female ,Particulate Matter ,business ,Biomarkers - Abstract
We conducted a crossover study employing air cleaner intervention among 125 schoolchildren aged 9-12 years in a boarding school in Beijing, China. The PM concentrations were monitored, and 27 biomarkers were analyzed. We used the linear mixed-effects model to evaluate the association of intervention/time-weighted PM concentrations with biomarkers. The outcomes showed that air cleaner intervention was associated with FeNO, exhaled breath condensate (EBC) IL-1β, and IL-6, which decreased by 12.57%, 10.83%, and 4.33%, respectively. Similar results were observed in the associations with PMs. Lag 1 day PMs had the strongest relationship with biomarkers, and significant changes were observed in biomarkers such as FEV1, FeNO, EBC 8-iso, and MCP-1. Boys showed higher percentage changes than girls, and the related biomarkers were FeNO, EBC 4-HNE, IL-1β, IL-6, and MCP-1. The results showed that biomarkers such as FeNO, EBC IL-6, MCP-1, and 4-HNE could sensitively reflect the early abnormal response of the respiratory system under short-term PM exposure among healthy schoolchildren and indicated that (1) air cleaners exert a protective effect on children's respiratory system. (2) PM had lag and cumulative effect, lag 1 day had the greatest effect. (3) The boys were more sensitive than the girls.
- Published
- 2021
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