A research of Washington University School of Medicine in St. Louis links
outdoor air pollution, even at levels deemed safe, to an increased risk of diabetes globally.
Researchers at the university, in collaboration with scientists at the Veterans Affairs’ Clinical Epidemiology
Centre, examined the relationship between particulate matter and the risk of diabetes.
They first analysed data from 1.7 million U.S. veterans, who did not have histories of diabetes and were followed for a median
of 8.5 years.
The researchers linked the patient data with the Environmental Protection Agency’s (EPA) land-based air monitoring
systems as well as space-borne satellites operated by the National Aeronautics and Space Administration (NASA).
They used several statistical models and tested the validity against controls such as ambient air sodium
concentrations, and lower limb fractures, as well as the risk of developing diabetes.
This exercise helped the researchers weed out spurious associations.
Then they sifted through all research related to diabetes and outdoor air pollution and devised a model to evaluate
diabetes risk across various pollution levels.
Finally, the researchers analyzed data from the Global Burden of Disease study, which is conducted annually with
contributions from researchers worldwide.
“Our research shows a significant link between air pollution and diabetes globally,” said Ziyad Al-Aly, the
study’s senior author and an assistant professor of medicine at Washington University.
“We found an increased risk, even at low levels of air pollution currently considered safe by the U.S. EPA
and the World Health Organisation (WHO).
Evidence shows that current levels are still not sufficiently safe and need to be tightened,” the researcher added.
Among a sample of veterans exposed to pollution at a level between five to ten micrograms per cubic meter of air,
about 21 per cent developed diabetes.
When that exposure increased to 11.9 to 13.6 micrograms per cubic meter of air, about 24 per cent of the group
The researchers also found that the overall risk of pollution-related diabetes is tilted more toward lower-income
countries such as India that lack the resources for environmental mitigation systems and clean-air policies.
Diabetes affects more than 420 million people worldwide and 30 million Americans.
In the U.S., the study attributed 150,000 new cases of diabetes per year to air pollution and 350,000 years of
healthy life lost annually.
The findings were published in the Lancet Planetary Health.
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