Neurology
Air pollution tied to more acute migraine visits
Clinical takeaway: Air pollution may act as a migraine trigger, not just background risk, and weather conditions amplify that effect. Patients may benefit from checking local air quality reports, especially nitrogen dioxide levels, during high-risk weather periods to guide indoor time as well as early preventive or abortive treatment.
Migraine triggers are often hard to predict in real time. This study tested whether day-to-day pollution and weather patterns were linked to acute migraine activity and sustained treatment use.
Researchers linked daily pollution and meteorologic data with emergency migraine-related encounters and quarterly triptan use over a mean follow-up of just over 10 years in a population-based case-crossover study of 7,032 adults with migraine.
The strongest short-term signal was nitrogen dioxide: high exposure one day earlier was associated with 41% higher odds of an emergency migraine-related visit. Solar radiation was also associated with increased risk.
Over longer time windows, cumulative nitrogen dioxide exposure was associated with 10% higher triptan use, and cumulative exposure with 9% higher use. Weather modified the risk with hot, dry weeks amplifying the effect of nitrogen dioxide, while cold, humid weeks intensified the effect.
The findings suggest that environmental exposures may shape both when migraine attacks break through and how active disease remains over time. That could make pollution and weather forecasts clinically useful for short-term prevention planning in selected patients.
Exposure was estimated from monitoring stations rather than personal measurements, and outcomes were based on emergency visits and pharmacy data, so the findings mainly reflect more severe migraine.
“These results help us to better understand how and when migraine attacks occur,” said study author Ido Peles, MD, of Ben-Gurion University of the Negev in Be’er Sheva, Israel. “They suggest that for people who have a susceptibility to migraine to begin with, environmental factors may play two roles: intermediate-term factors such as heat and humidity may modify the risk for attacks, while short-term factors such as spikes in pollution levels may trigger attacks.”
Source: Peles I. Neurology. 2026 May 12. Acute Environmental Triggers and Intermediate-Term Modulators of Emergency Migraine-Related Health Care Encounters