Academic journal article Environmental Health Perspectives

Hearts over Time: Cardiovascular Mortality Risk Linked to Long-Term P[M.Sub.2.5] Exposure

Academic journal article Environmental Health Perspectives

Hearts over Time: Cardiovascular Mortality Risk Linked to Long-Term P[M.Sub.2.5] Exposure

Article excerpt

Adverse respiratory effects and short-term hospital admissions have been linked to acute exposure to fine particulate matter (P[M.sub.2.5]), but few studies have examined mortality risks associated with chronic exposure. Now, in Canada's first national-level cohort study of the subject, investigators report an association between cardiovascular mortality and long-term exposure to P[M.sub.2.5] [EHP 120(5):708-714; Crouse et al.].

Most research examining associations between ambient air pollution and human health has used data generated by ground-based air-pollution monitors over short periods of time. But in the current study, researchers also calculated long-term exposure levels using satellite-based estimates of ground-level P[M.sub.2.5].

Study subjects consisted of 2.1 million adults who were included in the 1991-2001 Canadian census mortality follow-up study. For residents of cities with ground-based air monitors, the investigators calculated average mean annual concentrations of P[M.sub.2.5] for the period 1987-2001 and assigned exposure levels to individuals based on their residence during that time. They also calculated exposure estimates for the whole cohort for the period 2001-2006 based on satellite remote sensing observations.

The team linked the census and exposure data to national mortality data to estimate increased risk of death from ischemic heart disease, cerebrovascular disease, cardiovascular disease, circulatory disease, and all nonaccidental causes for each 10-[micro]g/[m. …

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