The NCR heart attack epidemic: How Delhi’s toxic air could be putting young, non-smokers at risk

For a young professional who does not smoke, eats reasonably well and exercises regularly, a heart attack may seem like a distant possibility. Yet, cardiovascular risk is not determined by lifestyle alone. In Delhi and the National Capital Region (NCR), where air pollution remains a persistent public health concern, the air people breathe deserves greater attention in conversations about heart health.

Although there is insufficient evidence to establish a heart attack epidemic specifically among young, otherwise healthy non-smokers in the NCR, research increasingly shows that prolonged exposure to polluted air can raise the risk of cardiovascular disease. This makes air pollution an important concern even for people who appear healthy.

How polluted air affects the heart

The danger lies partly in PM2.5, fine particles measuring 2.5 micrometres or less in diameter. These particles are small enough to penetrate deep into the lungs, where they can trigger inflammation and contribute to changes affecting blood vessels and circulation.

Some particles and their associated pollutants can also promote oxidative stress, a process that damages cells, and impair the normal functioning of blood vessel linings. Over time, these changes may contribute to the build-up of fatty deposits in arteries, making them more vulnerable to cardiovascular events.

Pollution can also influence blood pressure, the body's inflammatory response and the tendency of blood to clot. If a clot blocks blood flow through a coronary artery, the heart muscle is deprived of oxygen, resulting in a heart attack. In some cases, a heart attack can lead to cardiac arrest, when the heart suddenly stops pumping blood effectively. The two conditions are related but are not interchangeable.

Why the chemical composition of pollution matters

Not all fine particles have the same chemical composition. A study published in the Journal of the American College of Cardiology in 2026 examined long-term exposure to different PM2.5 components among more than 100,000 adults in China. It found associations between exposure to organic carbon, elemental carbon and nitrates and an increased risk of coronary heart disease.

These findings highlight an important point: assessing air pollution solely by the total quantity of particles may not capture the full health risk. Traffic exhaust, diesel combustion, industrial activity and other sources can contribute different pollutants to the air.

Delhi-NCR faces a combination of these emissions, alongside seasonal influences such as crop-residue burning and weather conditions that trap pollution close to the ground. However, research conducted in China cannot, by itself, establish the exact contribution of individual pollutants to heart attacks in Delhi.

Why young, non-smokers should pay attention

Being young, maintaining a healthy weight and avoiding tobacco can substantially improve cardiovascular health, but they do not eliminate risk. Air pollution can act alongside less obvious factors, including inherited cholesterol disorders, undiagnosed high blood pressure, diabetes and a family history of premature heart disease.

For cardiologists, the priority is to assess the complete risk profile rather than assume that a young patient is protected simply because they do not smoke.

Practical steps to protect the heart

1. Check air quality before outdoor exercise. Monitor the Air Quality Index (AQI) and move strenuous workouts indoors when pollution levels are high. Exercise remains beneficial, but its location and intensity should be adjusted to conditions.

2. Reduce exposure during severe pollution. Keep windows closed when outdoor air is particularly polluted, use appropriately sized air purifiers with HEPA filtration where feasible, and avoid heavily trafficked roads when walking or cycling.

3. Wear a well-fitting N95 or equivalent respirator outdoors. It can reduce exposure to fine particles, although it cannot eliminate all pollutants or guarantee protection against cardiovascular effects.

4. Do not ignore conventional risk factors. Check blood pressure, cholesterol and blood glucose as advised by a healthcare professional. People with a strong family history of early heart disease may need an earlier assessment.

5. Recognise warning signs. Chest pressure, breathlessness, cold sweating, nausea or pain spreading to the arm, back or jaw can indicate a heart attack. Symptoms may be subtle, particularly in some younger patients. Emergency medical help should be sought immediately rather than waiting for symptoms to pass.

Cleaner air is a cardiovascular priority

Individual precautions can help reduce exposure, but they cannot replace effective pollution control. Better public transport, cleaner industrial processes, reduced diesel emissions and sustained action against multiple pollution sources are essential.

For cardiologists, the message is clear: heart health extends beyond diet, exercise and medication. In a polluted city, cleaner air is also part of prevention—and protecting the heart must begin long before a patient reaches the emergency department.

Dr Anshul Kumar Jain is the director of cardiology at the CK Birla Hospital®, Delhi. 

 

The opinions expressed in this article are those of the author and do not purport to reflect the opinions or views of THE WEEK.