Abstract:
BACKGROUND:Chronic exposure to traffic-related air pollution (TRAP) may contribute to premature mortality, but few studies to date have addressed this topic. OBJECTIVES:In this study we assessed the association between TRAP and mortality in Toronto, Ontario, Canada. METHODS:We collected nitrogen dioxide samples over two seasons using duplicate two-sided Ogawa passive diffusion samplers at 143 locations across Toronto. We calibrated land use regressions to predict NO2 exposure on a fine scale within Toronto. We used interpolations to predict levels of particulate matter with aerodynamic diameter < or = 2.5 microm (PM(2.5)) and ozone levels. We assigned predicted pollution exposures to 2,360 subjects from a respiratory clinic, and abstracted health data on these subjects from medical billings, lung function tests, and diagnoses by pulmonologists. We tracked mortality between 1992 and 2002. We used standard and multilevel Cox proportional hazard models to test associations between air pollution and mortality. RESULTS:After controlling for age, sex, lung function, obesity, smoking, and neighborhood deprivation, we observed a 17% increase in all-cause mortality and a 40% increase in circulatory mortality from an exposure contrast across the interquartile range of 4 ppb NO2. We observed no significant associations with other pollutants. CONCLUSIONS:Exposure to TRAP was significantly associated with increased all-cause and circulatory mortality in this cohort. A high prevalence of cardiopulmonary disease in the cohort probably limits inference of the findings to populations with a substantial proportion of susceptible individuals.
journal_name
Environ Health Perspectjournal_title
Environmental health perspectivesauthors
Jerrett M,Finkelstein MM,Brook JR,Arain MA,Kanaroglou P,Stieb DM,Gilbert NL,Verma D,Finkelstein N,Chapman KR,Sears MRdoi
10.1289/ehp.11533subject
Has Abstractpub_date
2009-05-01 00:00:00pages
772-7issue
5eissn
0091-6765issn
1552-9924journal_volume
117pub_type
杂志文章abstract:BACKGROUND:Although it is well established that air pollutants can exacerbate asthma, the link with new asthma onset in children is less clear. OBJECTIVE:We assessed the association between the onset of childhood asthma with both time of birth and time-varying exposures to outdoor air pollutants. METHOD:An open cohor...
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