Long-term urban particulate air pollution, traffic noise, and arterial blood pressure
- PMID: 21827977
- PMCID: PMC3261981
- DOI: 10.1289/ehp.1103564
Long-term urban particulate air pollution, traffic noise, and arterial blood pressure
Abstract
Background: Recent studies have shown an association of short-term exposure to fine particulate matter (PM) with transient increases in blood pressure (BP), but it is unclear whether long-term exposure has an effect on arterial BP and hypertension.
Objectives: We investigated the cross-sectional association of residential long-term PM exposure with arterial BP and hypertension, taking short-term variations of PM and long-term road traffic noise exposure into account.
Methods: We used baseline data (2000-2003) on 4,291 participants, 45-75 years of age, from the Heinz Nixdorf Recall Study, a population-based prospective cohort in Germany. Urban background exposure to PM with aerodynamic diameter ≤ 2.5 μm (PM(2.5)) and ≤ 10 μm (PM(10)) was assessed with a dispersion and chemistry transport model. We used generalized additive models, adjusting for short-term PM, meteorology, traffic proximity, and individual risk factors.
Results: An interquartile increase in PM2.5 (2.4 μg/m(3)) was associated with estimated increases in mean systolic and diastolic BP of 1.4 mmHg [95% confidence interval (CI): 0.5, 2.3] and 0.9 mmHg (95% CI: 0.4, 1.4), respectively. The observed relationship was independent of long-term exposure to road traffic noise and robust to the inclusion of many potential confounders. Residential proximity to high traffic and traffic noise exposure showed a tendency toward higher BP and an elevated prevalence of hypertension.
Conclusions: We found an association of long-term exposure to PM with increased arterial BP in a population-based sample. This finding supports our hypothesis that long-term PM exposure may promote atherosclerosis, with air-pollution-induced increases in BP being one possible biological pathway.
Conflict of interest statement
The authors declare they have no actual or potential competing financial interests.
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