To investigate acute, irreversible effects of exposure to ozone and other air pollutants, the authors examined daily death counts in relation to air pollution levels in Mexico City during 1990-1992.
When considered singly in Poisson regression models accounting for periodic effects, the rate ratio for total mortality associated with a 100-ppb increment in 1-hour maximum ozone concentration was 1.024 (95% confidence interval (Cl) 1.011-1.039).
Measures of average ozone concentration were somewhat more strongly related to mortality.
The rate ratio was 1.024 (95% Cl 0.984-1.062) per 100 ppb for sulfur dioxide and 1.050 (95% Cl 1.030-1.067) per 100 mug/m3 for total suspended particulates.
However, when all three pollutants were considered simultaneously, only total suspended particulates remained associated with mortality, indicating excess mortality of 6% per 100 mug/m3 (rate ratio=1.058,95% CI 1.033-1.083), consistent with observations in other cities in the United States and Europe.
The authors found no independent effect of ozone, but it is difficult to attribute observed effects to a single pollutant in light of the complexity and variability of the mixture to which people are exposed.
Nevertheless, particulate matter may be a useful indicator of the risk associated with ambient air pollution.
Mots-clés Pascal : Pollution air, Ozone, Particule en suspension, Toxicité, Santé et environnement, Mortalité, Homme, Epidémiologie, Mexique, Amérique Centrale, Amérique, Zone urbaine
Mots-clés Pascal anglais : Air pollution, Ozone, Suspended particle, Toxicity, Health and environment, Mortality, Human, Epidemiology, Mexico, Central America, America, Urban area
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 97-0171540
Code Inist : 002B30A02A. Création : 21/05/1997.