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CO and Mortality, Phoenix, Arizona 1995-1997:

OBJECTIVES: We evaluated the association between mortality outcomes in elderly individuals and particulate matter (PM) of varying aerodynamic diameters (in micrometers) [PM(10), PM(2.5), and PM(CF)(PM(10) minus PM(2.5))], and selected particulate and gaseous phase pollutants in Phoenix, Arizona, using 3 years of daily data (1995-1997). Although source apportionment and epidemiologic methods have been previously combined to investigate the effects of air pollution on mortality, this is the first study to use detailed PM composition data in a time-series analysis of mortality. Phoenix is in the arid Southwest and has approximately 1 million residents (9.7% of the residents are > 65 years of age).

METHODS: PM data were obtained from the U.S. Environmental Protection Agency (EPA) National Exposure Research Laboratory Platform in central Phoenix. We obtained gaseous pollutant data, specifically carbon monoxide (CO), nitrogen dioxide (NO2), ozone (O3), and sulfur dioxide (SO2) data, from the EPA Aerometric Information Retrieval System Database. We used Poisson regression analysis to evaluate the associations between air pollution and non-accidental mortality and cardiovascular mortality.

RESULTS: Total mortality was significantly associated with CO and NO2 (p < 0.05), and weakly associated with SO2, PM(10), and PM(CF) (p < 0.10). Cardiovascular mortality was significantly associated with CO, NO2, SO2, PM(2.5), PM(10), PM(CF) (p < 0.05), and elemental carbon.

CONCLUSIONS: Factor analysis revealed that both combustion-related pollutants and secondary aerosols (sulfates) were associated with cardiovascular mortality.

Location of authors: Department of Environmental Health, University of Washington, Seattle, Washington, USA

From: Mar, T.F., Norris, G.A., Koenig, J.Q., Larson, T.V. (2000) Associations between air pollution and mortality in Phoenix, 1995-1997. Environ. Health Perspectives, 108, 347-353.

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