Heat and air pollution interacted in studies of death and disease
A review of European and North American studies found interactions between heat, several pollutants and health outcomes. Evidence concerning cold weather was more limited, and results were not summarized as one risk estimate.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
Across the reviewed studies, higher temperatures interacted with ozone and airborne particles in associations with mortality. Particle pollution also interacted with heat in associations involving cardiovascular or respiratory disease. The pattern was not uniform across pollutants and outcomes, and evidence about cold weather was limited. These associations do not establish causation or supply a single combined risk figure.
The review was restricted to Europe and North America. Some included studies omitted potentially relevant confounding factors, and the abstract provides no interaction effect sizes or confidence intervals.
What an interaction asks
The review asked whether pollution's association with health differed under different weather conditions, and vice versa. It organized findings by pollutant, weather measure and health outcome, rather than assuming every combination had the same relationship.
Where evidence was thinner
Cold-weather interactions had limited evidence, with exceptions involving fine particles, cardiovascular illness and childhood asthma. The authors also identified gaps beyond temperature and called for comparisons across more regions, climates and populations.
The original publication
The interaction between air pollution, weather conditions, and health risks: a systematic review.
Rackow B, König HH, Wall M et al.
Sci Total Environ · 2025
- PubMed ID
- 40749248
- Record checked
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