Greater long- and short-term exposures to outdoor air pollution (PM1, PM2.5, PM10) and ozone were associated with increased odds of diabetes and dyslipidemia.

By Anaya Malik


RT’s Three Key Takeaways:

  1. Outdoor air pollution linked to metabolic disorders – In a longitudinal cohort of middle-aged and older adults, higher long- and short-term exposures to outdoor particulate matter (PM1, PM2.5, PM10) and ozone were associated with increased odds of diabetes and dyslipidemia, even after adjustment for major confounders.
  2. Fine particles show the strongest effects – PM1 consistently demonstrated larger effect estimates than coarser particles, with particularly strong short-term associations for both diabetes and dyslipidemia, suggesting metabolic risk may be sensitive to recent as well as cumulative exposure.
  3. Chemical composition matters – Several PM2.5 constituents, including chloride, ammonium, sulfate, and nitrate, showed dose-dependent relationships with glycolipid disorders, whereas indoor pollution from solid fuel use was not significantly associated—highlighting outdoor air quality, especially fine particulate composition, as a potential target for metabolic disease prevention.


Glycolipid metabolic disorders include diabetes mellitus and dyslipidemia, yet the contribution of ambient exposures remains incompletely characterized. In this longitudinal cohort analysis of middle-aged and older adults, researchers examined whether outdoor particulate matter and ozone (O3) were associated with incident glycolipid metabolic disorders, and whether relationships differed by exposure window.

Using multivariable logistic regression adjusted for key factors including age, sex, and smoking status, the study evaluated particulate matter (PM1, PM2.5, PM10) and ozone across long-term (5-year average) and short-term (1-year average) exposure periods. Long-term increases per 1 μg/m³ in PM1, PM2.5, PM10, and O3 were consistently linked with higher odds of diabetes and dyslipidemia, with PM1 showing comparatively larger effect estimates.

Short-term exposure showed even stronger associations for select pollutant and outcome pairs. Notably, PM1 demonstrated robust short-term relationships with dyslipidemia and diabetes, suggesting metabolic vulnerability may track with more proximate exposure patterns in addition to longer accumulation windows.

The investigators also assessed PM2.5 chemical components and reported dose-dependent relationships between several constituents and both diabetes and dyslipidemia. Chloride (Cl-), ammonium (NH4+), sulfate (SO4 2-), and nitrate (NO3-) each tracked with higher odds, with particularly large estimates reported for chloride per 1 μg/m³ for both outcomes.

In contrast, indoor pollutants related to solid fuel use were not significantly associated with diabetes or dyslipidemia in either long-term or short-term models. The authors interpret this divergence as underscoring the potential importance of targeted outdoor air quality interventions to reduce metabolic risk at the population level, with particular attention to fine particulate fractions and their chemical makeup.


Reference

Zhou C et al. Long-term and short-term exposure to outdoor air pollution and its association with glycolipid metabolic disorders. World J Diabetes. 2025;16(12):110028.

This article was originally published by AMJ and was made available under the terms of the Creative Commons Attribution-Non Commercial 4.0 License.