As an approach to evaluating the public health burden from current air pollution levels, we examined the relationship of daily emergency room (ER) visits for respiratory illnesses (25 hospitals, average 98 visits/d) to air pollution in Montreal, Canada, from June through September, 1992 and 1993.
Air pollutants measured included ozone (O3), particulate matter diameter<10 mum (PM10) and<2.5 mum (PM2.5), the sulfate fraction of PM2.5 (SO4), and aerosol strong acidity (H+). Temporal trends, autocorrelation, and weather were controlled for in time-series regressions.
For 1992, no significant associations with ER visits were found.
However, 33% of the particulate data were missing.
For 1993,1-h maximum O3, PM10, PM2.5, and SO4 were all positively associated with respiratory visits for patients over 64 yr of age (p<0.02).
An increase to the mean level of 1-h maximum O3 (36 ppb) was associated with a 21% increase over the mean number of daily ER visits (95% confidence interval [Cl] : 8 to 34%). Effects of particulates were smaller, with mean increases of 16% (4 to 28%), 12% (2 to 21%) and 6% (1 to 12%) for PM10, PM2.5, and SO4, respectively.
Relative mass effects were PM2.5>PM10>>SO4.
Ozone and PM10 levels never exceeded 67 ppb and 51 mug/m3, respectively (well below the U.S. National Ambient Air Quality Standards of 120 ppb and 150 mug/m3, respectively). (...)
Mots-clés Pascal : Fréquence, Admission hôpital, Service hospitalier, Taux, Pollution air, Québec, Canada, Amérique du Nord, Amérique, Exploration, Relation, Homme, Urgence
Mots-clés Pascal anglais : Frequency, Hospital admission, Hospital ward, Rate, Air pollution, Quebec, Canada, North America, America, Exploration, Relation, Human, Emergency
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 97-0188449
Code Inist : 002B30A02A. Création : 21/05/1997.