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Title: Stronger associations between daily mortality and fine particulate air pollution in summer than in winter: evidence from a heavily polluted region in western Europe
Authors: Nawrot, Tim ×
Torfs, H
Fierens, F
De Henauw, S
Hoet, Peter
Van Kersschaever, Greta
De Backer, G
Nemery, Benoit #
Issue Date: Feb-2007
Series Title: Journal of Epidemiology and Community Health vol:61 issue:2 pages:146-149
Abstract: BACKGROUND: Numerous studies have shown a strong association between daily mortality and small particulate with a diameter of <10 microm (PM10) air pollution, but the effects of season have not always been well characterised. AIM: To study the shape of the association between short-term mortality and PM10 across seasons and quintiles of outdoor temperature. DESIGN, SETTING AND PARTICIPANTS: Daily data on mortality (n = 354 357), outdoor temperature and PM10 in Flanders, Belgium, from January 1997 to December 2003, were analysed across warm versus cold periods of the year (April-September v October-March), with seasons and quintiles of outdoor temperature as possible effect modifiers. RESULTS: There was a significant (p<0.001) interaction between PM10 and period of the year in relation to mortality. To allow for non-linearity, daily mean PM10 concentrations were categorised into quartiles. Season-specific PM10 quartiles showed a strong and steep linear association between mortality and PM10 in summer and a less linear association in spring and autumn, whereas in winter the association was less strong and mortality was only increased in the highest PM10 quartile. The effect sizes expressed as the percentage increase in mortality on days in the highest season-specific PM(10) quartile versus the lowest season-specific PM10 quartile were 7.8% (95% CI 6.1 to 9.6) in summer, 6.3% (4.7 to 7.8) in spring, 2.2% (0.58 to 3.8) in autumn and 1.4% (0.06 to 2.9) in winter. An analysis by quintiles of temperature confirmed these effect sizes. CONCLUSION: The short-term effect of particulate air pollution on mortality strongly depends on outdoor temperature, even in a temperate climate.
ISSN: 0143-005X
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Academic Center for General Practice
Environment and Health - miscellaneous
Department of Public Health miscellaneous
Occupational, Environmental and Insurance Medicine (-)
× corresponding author
# (joint) last author

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