Delhi-NCR Air Pollution May Increase Stroke Risk: How Toxic Air Affects Brain Health

New Delhi: Rising air pollution across Delhi-NCR is becoming an important environmental health concern, with research linking exposure to polluted air to a higher risk of stroke. Both short-term exposure lasting a few days and prolonged exposure over several years have been associated with an increased risk of ischaemic stroke.

Air pollution in Delhi is linked to the effects of rapid urbanisation and industrialisation. It consists of a complicated mixture of gases, liquids and tiny particles. Larger particles, known as PM10, are commonly associated with industrial emissions, while smaller pollutants such as PM2.5 and PM0.1 mainly come from vehicle traffic.

How Air Pollution Is Linked to Different Types of Stroke

The impact of polluted air appears to be particularly significant in people who experience ischaemic stroke because of large artery disease or small vessel disease. The risk may also be greater among individuals who already have cardiovascular risk factors. Studies have not identified clear differences in this effect based on age or sex.

Short-term exposure to polluted air has also been associated with a higher risk of intracerebral haemorrhage, a type of bleeding inside the brain. However, the same link has not been clearly established for haemorrhagic stroke as a whole.

Long-term exposure may increase the overall risk of haemorrhagic stroke. However, research specifically examining the relationship between prolonged air pollution exposure and intracerebral haemorrhage remains limited.

How Polluted Air Can Damage Blood Vessels

Exposure to harmful air pollutants may affect the cardiovascular system in several ways. It can contribute to an increase in heart rate and blood pressure, along with changes in fibrinogen levels and other blood-clotting factors.

Polluted air may also cause blood vessels to narrow, increase inflammatory substances such as C-reactive protein (CRP), and damage the endothelium, which is the inner lining of blood vessels.

When toxic particles are inhaled, they can trigger oxidative stress in the body. This process may damage the blood vessel lining and interfere with its normal functioning, a condition known as endothelial dysfunction. Such changes may contribute to an increased risk of stroke.

Ways to Reduce Exposure to Air Pollution

Reducing contact with polluted air is an important preventive step, particularly when pollution levels are high. Some recommended precautions include:

• Wear a properly fitted N95 or N99 mask when going outdoors.
• Use HEPA air purifiers inside the home.
• Keep windows closed during periods of heavy pollution.
• Avoid strenuous outdoor exercise when air quality is poor.

These precautions can help limit exposure to harmful airborne particles during periods of high pollution.

Disclaimer

This article is intended for general awareness and informational purposes only. The health information presented should not be considered a substitute for professional medical advice, diagnosis or treatment. The relationship between air pollution and stroke risk may vary depending on individual health conditions and exposure levels. Consult a qualified healthcare professional for personal medical concerns or guidance. In case of suspected stroke symptoms, seek emergency medical attention immediately.