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Blending multiple nitrogen dioxide data sources for neighborhood estimates of long-term exposure for health research


Hanigan, IC and Williamson, GJ and Knibbs, LD and Horsley, J and Rolfe, MI and Cope, M and Barnett, AG and Cowie, CT and Heyworth, JS and Serre, ML and Jalaludin, B and Morgan, GG, Blending multiple nitrogen dioxide data sources for neighborhood estimates of long-term exposure for health research, Environmental Science and Technology, 51, (21) pp. 12473-12480. ISSN 0013-936X (2017) [Refereed Article]


Copyright Statement

2017 American Chemical Society

DOI: doi:10.1021/acs.est.7b03035


Exposure to traffic related nitrogen dioxide (NO2) air pollution is associated with adverse health outcomes. Average pollutant concentrations for fixed monitoring sites are often used to estimate exposures for health studies, however these can be imprecise due to difficulty and cost of spatial modeling at the resolution of neighborhoods (e.g., a scale of tens of meters) rather than at a coarse scale (around several kilometers). The objective of this study was to derive improved estimates of neighborhood NO2 concentrations by blending measurements with modeled predictions in Sydney, Australia (a low pollution environment). We implemented the Bayesian maximum entropy approach to blend data with uncertainty defined using informative priors. We compiled NO2 data from fixed-site monitors, chemical transport models, and satellite-based land use regression models to estimate neighborhood annual average NO2. The spatial model produced a posterior probability density function of estimated annual average concentrations that spanned an order of magnitude from 3 to 35 ppb. Validation using independent data showed improvement, with root mean squared error improvement of 6% compared with the land use regression model and 16% over the chemical transport model. These estimates will be used in studies of health effects and should minimize misclassification bias.

Item Details

Item Type:Refereed Article
Keywords:air pollution, model blending, exposure, health
Research Division:Mathematical Sciences
Research Group:Statistics
Research Field:Applied statistics
Objective Division:Health
Objective Group:Public health (excl. specific population health)
Objective Field:Public health (excl. specific population health) not elsewhere classified
UTAS Author:Williamson, GJ (Dr Grant Williamson)
ID Code:121696
Year Published:2017
Web of Science® Times Cited:6
Deposited By:Plant Science
Deposited On:2017-10-11
Last Modified:2018-05-08
Downloads:106 View Download Statistics

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