Air Pollution a Rising Threat to Type 2 Diabetes

MUMBAI: Recent studies have unveiled a concerning correlation between air pollution and an increased risk of Type 2 diabetes, highlighting a burgeoning public health crisis.

While air pollutants like PM2.5 are well-documented triggers for respiratory and cardiovascular diseases, their impact on diabetes is gaining significant attention. Emerging research from various global regions, including the United States, Europe, and China, has supported this association. A recent Indian study has further quantified the effects, revealing that even a minor increase in PM2.5 levels can significantly elevate blood sugar levels.

Earlier this month, the Journal of the Association of Physicians of India (JAPI) published an editorial titled “Air Pollution: A New Cause of Type 2 Diabetes?” Co-authored by leading diabetologists, the piece underscores the role of PM2.5 as an endocrine disruptor that hampers insulin secretion and induces insulin resistance. Despite a temporary respite in air quality due to seasonal variations, air pollution remains a formidable challenge in urban India, with Mumbai and Delhi reporting annual fatalities of approximately 20,000 and 50,000 respectively due to polluted air.

In collaboration with the Public Health Foundation of India, researchers recently published a groundbreaking study in ‘BMJ Open Diabetes Research & Care’. This study, the first of its kind in India, elucidates the short-, medium-, and long-term impacts of PM2.5 exposure on diabetes. The findings are alarming: a 10 µg/m³ increase in PM2.5 monthly average exposure correlates with a 0.4 mg/dL rise in blood sugar levels and a 0.021 unit increase in HbA1c levels. HbA1c tests are critical as they provide an average blood sugar level over a three-month period.

The study monitored 12,064 adults from Delhi and Chennai over seven years. Researchers employed a hybrid satellite-based exposure model alongside ground readings to track daily PM2.5 levels. Blood sugar levels were measured during follow-up visits, revealing a 22% increased risk of developing Type 2 diabetes with each 10 µg/m³ rise in annual PM2.5 exposure. These findings underscore the urgent need for robust air quality management and public health strategies to mitigate the adverse effects of air pollution. As urbanisation continues to rise, addressing environmental factors that contribute to chronic health conditions like diabetes is crucial for safeguarding public health.