More walking linked to fewer COPD flare-ups despite air pollution

Clinical takeaway: Continue encouraging regular walking in patients with COPD, including those living in areas with air pollution levels similar to those studied in Europe, while still advising patients to minimize pollution exposure when possible.

Walking is associated with better outcomes in COPD, but exercise increases ventilation and therefore the amount of polluted air inhaled, raising concern that pollution could diminish its benefits. Until now, there had been no studies examining whether long-term air pollution modifies the association between walking and COPD exacerbations.

In a prospective cohort study, researchers followed 262 adults with COPD from the UK, Spain, Belgium, Switzerland, and Greece. Participants wore movement sensors for 7 days to objectively measure daily steps, walking duration, and walking speed; researchers estimated residential exposure to PM2.5, black carbon, nitrogen dioxide, and ozone over the preceding 2 years and tracked moderate-to-severe exacerbations for approximately 2 years.

Participants walked a median of about 7,400 steps per day. During follow-up, 63% experienced at least 1 moderate-to-severe exacerbation. Each additional 1,000 daily steps was associated with an approximately 5% lower exacerbation rate. Importantly, that association did not differ according to long-term exposure to any of the 4 pollutants studied, and findings were similar across smoking status and COPD severity.

Walking speed alone was not associated with exacerbation rate, although the protective association with higher step counts appeared stronger among people who regularly achieved faster walking speeds. The authors cautioned that the findings may not apply to areas with extremely high pollution levels and emphasized that reducing pollution exposure remains important.

“The take home message from our study is not that we don’t need to worry about air pollution,” lead author Alícia Josa-Culleré said. “Rather, our findings suggest that walking is still better than remaining regularly inactive, even for people living in relatively polluted areas.”

Source: Josa-Culleré A, et al. (2026 Oct 5) ERJ Open Res. Interaction of walking activity and long-term air pollution on exacerbation rate in COPD