Older and middle-aged adults living with diabetes may face a markedly increased risk of cardiovascular disease if they are exposed to air pollution over extended periods, according to new research conducted in China.The study drew on data from a large, nationally representative survey involving adults aged 45 and above. Researchers followed over 5,400 participants for four years beginning in 2011, investigating how long-term exposure to different air pollutants affected the development of heart-related conditions—particularly among those with diabetes.Participants were categorised based on their diabetes status and whether they developed cardiovascular disease during the study. The conditions examined included heart attack, coronary artery disease, angina, heart failure, stroke, and other related disorders. Diabetes diagnoses were based on standard clinical criteria, while cardiovascular cases were identified through self-reported health information.
Results showed that 13.8% of individuals with diabetes developed cardiovascular disease, compared to 8.5% of those without the condition. The researchers found that with every interquartile increase in pollution levels, cardiovascular risk rose by 19% to 28%. Among the pollutants analysed, coarse particulate matter (PM10) had the strongest association with heart disease risk, followed by PM1, PM2.5, and ozone.To explore why some individuals were more vulnerable, the study used a biomarker called the Inflammatory Lipid Ratio (ILR). The findings suggest that pollutants entering the bloodstream can trigger systemic inflammation and damage tissues. Since people with diabetes already tend to have higher levels of inflammation and impaired lipid metabolism, they may experience an intensified effect, further raising their cardiovascular risk. This highlights the need for targeted prevention and treatment strategies for diabetic populations in polluted environments.
While the research was based on Chinese data, its implications extend to countries like India, where air pollution levels are often high, particularly during winter. With an estimated 90 million adults living with diabetes, the combined impact of pollution and metabolic disease presents a serious public health concern. Earlier studies in Indian cities have also indicated that exposure to fine particulate matter can increase blood sugar levels and the likelihood of developing Type 2 diabetes, reinforcing the broader health risks associated with polluted air.
