Mounting evidence suggests that air pollution contributes to the rapidly growing type 2 diabetes epidemic. Epidemiological studies have found exposures to ambient air pollutants, particularly fine particulate matter (PM2.5) and nitrogen dioxide (NO2), were associated with increased diabetes prevalence,1-13 incidence14-19 and mortality.20 Studies have also indicated that short- and long-term air pollution exposures may negatively impact early indicators …