期刊
ENVIRONMENTAL POLLUTION
卷 286, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2021.117582
关键词
Childhood asthma; Greenspace; Green view index
资金
- National Natural Science Foundation of China [M-0420, 82073502, 81872582, 81872583, 81950410633, 81972992]
- Science and Technology Program of Guangzhou [201807010032, 201803010054]
- National Key Research and Development Program of China [2018YFC1004300, 2018YFE0106900]
- Guangdong Provincial Natural Science Foundation Team Project [2018B030312005]
- Fundamental Research Funds for the Central Universities [19ykjc01]
- Natural Science Foundation of Guangdong Province [2020A1515011131, 2019A050510017, 2018B05052007, 2017A090905042]
This study introduces a novel greenness exposure assessment method to investigate the association between greenness exposure and childhood asthma. Findings suggest that exposure to trees may reduce the odds of childhood asthma, while exposure to grass may increase the odds. Additionally, PM2.5 levels may modify the associations of trees and grass with childhood asthma.
Limitations of Normalized Difference Vegetation Index (NDVI) potentially contributed to the inconsistent findings of greenspace exposure and childhood asthma. The aim of this study was to use a novel greenness exposure assessment method, capable of overcoming the limitation of NDVI to determine the extent to which it was associated with asthma prevalence in Chinese children. During 2009-2013, a cross-sectional study of 59,754 children aged 2-17 years was conducted in northeast China. Tencent street view images surrounding participants' schools were segmented by a deep learning model, and streetscape greenness was extracted. The green view index (GVI) was used to assign exposure and higher value indicates more green coverage. Mixed-effects logistic regression models were used to calculate the adjusted odds of asthma per interquartile range (IQR) increase of GVI for trees and grass. Participants were further stratified to investigate whether particulate matter with an aerodynamic diameter <2.5 mu m (PM2.5) was a modifier. An IQR increase in GVI(800m) for trees was associated with lower adjusted odds of doctor-diagnosed asthma (OR: 0.76; 95%CI: 0.72-0.80) and current asthma (OR: 0.82; 95%CI: 0.75-0.89). An IQR increase in GVI(800m) for grass was associated with higher adjusted odds of doctor-diagnosed asthma (OR: 1.04; 95%CI: 1.00-1.08) and current asthma (OR: 1.08; 95%CI: 1.02-1.14). After stratification by PM2.5 exposure level, the negative association between trees and asthma, and the positive association between grass and asthma were observed only in low PM2.5 exposure levels (<= median: 56.23 mu g/m(3)). Our results suggest that types of vegetation may play a role in the association between greenness exposure and childhood asthma. Exposure to trees may reduce the odds of childhood asthma, whereas exposure to grass may increase the odds. Additionally, PM2.5 may modify the associations of trees and grass with childhood asthma.
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