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Associations between size-segregated particle number concentrations and respiratory mortality in Beijing, China

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Numerous studies have described the adverse associations between particle mass and respiratory health. The aim of the study was to analyze the associations of particle properties, especially size-segregated particle number concentrations (PNC), and respiratory mortality in Beijing, P.R. China. We gathered daily values of respiratory mortality and air pollution data of the Beijing urban area. Generalized additive models were used to estimate the associations. Single pollutant models showed that delayed concentrations of SO2, total PNCs, and PNC of 300–1000 nm were adversely associated with total respiratory mortality. There was an indication that adverse health effects of PNCs might be stronger for stagnant air masses. Two-pollutant models verified the independence of associations of total PNCs of other pollutants (SO2, NO2, and PM10). In conclusion, particle number concentrations, especially accumulation mode particles, might be factors influencing the adverse associations between particulate matter and respiratory health.
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Keywords: air mass origin; particle number concentration; particle size fraction; respiratory mortality

Document Type: Research Article

Affiliations: 1: Helmholtz-Centre for Environmental Research (UFZ),Core Facility – Studies, Leipzig, Germany 2: Leibniz Institute for Tropospheric Research (IfT),Physics Department, Leipzig, Germany 3: School of Public Health, Department of Occupational and Environmental Health,Peking University, Beijing, P.R. China 4: State Key Joint Laboratory of Environmental Simulation and Pollution Control,College of Environmental Sciences and Engineering, Peking University, Beijing, P.R. China 5: Helmholtz Zentrum München – German Research Center for Environmental Health,Institute of Epidemiology, Neuherberg, Germany

Publication date: April 1, 2012

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