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Source-Specific Air Pollution and Risk of Chronic Obstructive Pulmonary Disease: A Pooled Cohort Study
Manuella Lech Cantuaria1,2, Aslak Harbo Poulsen1, Ole Raaschou-Nielsen1,3
1Work, Environment and Cancer, Danish Cancer Institute, Copenhagen 2100, Denmark.
Environmental Health Perspectives
|August 7, 2026
Summary
Long-term exposure to air pollution, including fine particulate matter (PM2.5) and nitrogen dioxide (NO2), increases chronic obstructive pulmonary disease (COPD) risk. Both traffic and other sources contribute, with varying effects by pollutant type.
Area of Science:
- Environmental Health
- Epidemiology
- Pulmonary Medicine
Background:
- The link between long-term air pollution exposure and chronic obstructive pulmonary disease (COPD) remains debated.
- Previous studies often overlooked specific emission sources and pollutants like ultrafine particles (UFP) and elemental carbon (EC).
Purpose of the Study:
- To investigate the association between long-term residential exposure to PM2.5, NO2, UFP, and EC and COPD risk.
- To differentiate the impact of traffic-related air pollution from other sources on COPD development.
Main Methods:
- Pooled data from two large Danish cohorts (N=159,769) with complete address histories.
- Estimated 10-year time-weighted average exposure to total, traffic, and other sources for PM2.5, NO2, UFP, and EC.
- Used Cox proportional hazards models, adjusting for demographic, socioeconomic, lifestyle factors, and smoking; evaluated effect modification by sex, smoking status, and asthma.
Main Results:
- All assessed air pollutants (PM2.5, NO2, UFP, EC) were associated with increased COPD risk.
- PM2.5 from non-traffic sources showed a stronger association with COPD than traffic-derived PM2.5.
- Traffic-related UFP and EC appeared more detrimental than their non-traffic counterparts.
Conclusions:
- Long-term exposure to air pollution from both traffic and other sources contributes to COPD risk.
- The specific pollutant and its source influence the magnitude of COPD risk.
- Findings highlight the need for further research in diverse populations and settings.
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