“Whether the disease becomes manifest and when this occurs is not only due to lifestyle or genetic factors, but also due to traffic-related air pollution,” said Professor Annette Peters, director of the Institute of Epidemiology II at Helmholtz Zentrum München and head of the research area of epidemiology of the DZD.
For the current study, she and her colleagues…analyzed the data of nearly 3,000 participants of the KORA study who live in the city of Augsburg and two adjacent rural counties. All individuals were interviewed and physically examined. Furthermore, the researchers took fasting blood samples, in which they determined various markers for insulin resistance and inflammation. In addition, leptin was examined as adipokine which has been suggested to be associated with insulin resistance. Non-diabetic individuals underwent an oral glucose tolerance test to detect whether their glucose metabolism was impaired.
The researchers compared these data with the concentrations of air pollutants at the place of residence of the participants, which they estimated using predictive models based on repeated measurements at…up to 40 sites…in the city and in the rural counties.
“The results revealed that people who already have an impaired glucose metabolism, so-called pre-diabetic individuals, are particularly vulnerable to the effects of air pollution,” said Dr. Kathrin Wolf, lead author of the study. “In these individuals, the association between increases in their blood marker levels and increases in air pollutant concentrations is particularly significant! Thus, over the long term — especially for people with impaired glucose metabolism — air pollution is a risk factor for type 2 diabetes.”
The authors are also concerned that the concentrations of air pollutants, though below EU threshold values, are still above the proposed guidelines of the World Health Organization… As a consequence, they demand changes in government policy: “Lowering the threshold for acceptable air pollution levels would be a prudent step,” said Dr. Alexandra Schneider, who was also involved in the study. “We are all exposed to air pollution. An individual reduction by moving away from highly polluted areas is rarely an option.”
Many folks currently focussed on the political battle over climate change have been at it for a long time. The crap air we’re all faced with as “normal” has been anything but normal for decades. Because we’ve moved slightly back from acid rain and a Love Canal in every backyard doesn’t mean we’ve won anything more than individual battles. Though significant, the full extent of poisoning of the Earth’s air breathers, water-drinkers, continues to demand a critical political movement against the polluters and their acolytes.