Synoptic weather patterns and modification of the association between air pollution and human mortality

To assess whether meteorological conditions modify the relationship between short-term exposure to ambient air pollution and mortality, an examination of air pollution and human mortality associations (ecologic) using hybrid spatial synoptic classification procedures was conducted. Concentrations of...

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Bibliographic Details
Published in:International journal of environmental health research 2005-10, Vol.15 (5), p.347-360
Main Authors: Rainham, Daniel G. C., Smoyer-Tomic, Karen E., Sheridan, Scott C., Burnett, Richard T.
Format: Article
Language:English
Subjects:
Air Pollutants - toxicity
Air pollution
Air Pollution - adverse effects
Canada
Carbon Monoxide - toxicity
Cardiovascular Diseases - mortality
Cities
Dust
Environmental Exposure - adverse effects
Humans
meteorological factors
Mortality
Nitrogen Dioxide - toxicity
Ozone - toxicity
Respiratory Tract Diseases - mortality
Seasons
Sulfur Dioxide - toxicity
Weather
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Summary:To assess whether meteorological conditions modify the relationship between short-term exposure to ambient air pollution and mortality, an examination of air pollution and human mortality associations (ecologic) using hybrid spatial synoptic classification procedures was conducted. Concentrations of air pollutants and human mortality from all non-accidental and cardiorespiratory causes were examined according to typical winter and summer synoptic climatologies in Toronto, Canada, between 1981 and 1999. Air masses were derived using a hybrid spatial synoptic classification procedure associating each day over the 19-year period with one of six different typical weather types, or a transition between two weather types. Generalized linear models (GLMs) were used to assess the risk of mortality from air pollution within specific air mass type subsets. Mortality follows a distinct seasonal pattern with a maximum in winter and a minimum in summer. Average air pollution concentrations were similar in both seasons with the exception of elevated sulfur dioxide levels in winter and elevated ozone levels in summer. Subtle changes in meteorological composition can alter the strength of pollutant associations with health outcomes, especially in the summer season. Although there does not appear to be any systematic patterning of modification, variation in pollutant concentrations seems dependent on the type of synoptic category present.
ISSN:0960-3123
1369-1619
DOI:10.1080/09603120500289119