Why do heart emergencies go up with rise in pollution in India’s capital city?

A recent pilot study published in the journal Discover Public Health by Springer Nature has established a direct and immediate link between rising air pollution and cardiovascular emergencies in Delhi. The research, titled “Piloting surveillance of environmental risks and cardiovascular events in Delhi and Shimla, India, 2021,” suggests that even short-term exposure to poor air quality can trigger significant heart-related health crises in urban environments.

Immediate Correlation Between AQI and Heart Emergencies

According to a report by the Times of India, the study was a collaborative effort involving experts from the National Centre for Disease Control (NCDC), the India Meteorological Department (IMD), and Safetynet. Researchers analysed over 41,000 hospital admissions and deaths related to cardiovascular disease (CVD) alongside daily air quality data between January and July 2021. The findings revealed a “one-day lag” effect in Delhi: every time pollution levels spiked, hospital admissions for heart issues rose significantly within 24 hours.

Specifically, the data showed that for every 10-unit increase in the Air Quality Index (AQI), cardiovascular events jumped by 1.8 per cent. The impact of particulate matter was even more pronounced, with admissions increasing by 1.2 per cent for PM10 and 2 per cent for PM2.5 per 10-unit rise.

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These associations remained statistically significant even after the team adjusted for seasonal trends, temperature, and humidity. Interestingly, while the study also monitored Shimla, it found no such consistent patterns there, despite the hill station occasionally exceeding particulate standards during early summer months.

Contrasting Lifestyles and Environmental Risk Factors

Beyond air quality, the research highlighted stark differences in the profiles of cardiac patients in the two cities. In Delhi, patients were generally younger and suffered from “urban” risk factors, including physical inactivity, high-salt and high-fat diets, hypertension, and psychological stress. Conversely, in Shimla, heart-related issues were more frequently associated with tobacco smoking and the use of solid fuels for cooking.

The disparity in domestic energy use was particularly striking: 98 per cent of Delhi patients used gas or electric appliances, whereas 67 per cent of those in Shimla relied on wood, coal, or kerosene. Furthermore, the most common diagnoses across both locations were myocardial infarction and coronary artery disease.

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The researchers concluded that India’s current National Outdoor Air and Disease Surveillance (NOADS) system, which primarily tracks respiratory conditions, should be expanded. Integrating cardiovascular data into routine surveillance would provide a more comprehensive view of how environmental exposure impacts public health, ultimately aiding in localised urban planning and emergency health system preparedness.