Delhi woke up under a thick blanket of haze on Tuesday, October 21, just a day after millions celebrated Diwali with fireworks, signalling the start of yet another pollution season that grips the city every winter.Residents of what is already the most polluted capital in the world were once again forced to breathe toxic air, classified under the “severe” category. In several parts of the city, the Air Quality Index (AQI) climbed beyond 500, about ten times higher than what the World Health Organization considers safe. In some areas, the concentration of PM2.5 and PM10 particles hit alarming peaks of around 1,800, fifteen to twenty times higher than healthy limits.While we often link these conditions to respiratory problems, experts say the damage extends to the heart as well. To understand this connection, we spoke with Dr Manav Manchanda, Director & Head of Respiratory, Critical Care and Sleep Medicine at Asian Hospital.How Does Air Pollution Affect The Heart?An AQI of 400 or more means the air is loaded with fine dust, toxic gases, and heavy metals, levels so high they can strain even healthy lungs and hearts. What was once seen as a seasonal nuisance has now turned into a slow-moving public health crisis affecting millions across Delhi and other northern cities where winter smog pushes AQI readings into the danger zone.These microscopic pollutants (PM2.5 and PM10) bypass the body’s natural filters in the nose and throat and reach deep into the lungs, settling in the bronchi and alveoli, the small air sacs responsible for oxygen exchange. The result is inflammation, oxidative stress, and swelling of the airways, often accompanied by excess mucus. Even healthy individuals may experience throat irritation, chest discomfort, or a persistent cough.But the harm does not stop at the lungs. According to Dr Manchanda, “Once particulate matter enters the bloodstream, it circulates through the body and causes inflammation in the blood vessels.” Over time, this inflammation stiffens the arteries, raises blood pressure, and can trigger irregular heart rhythms. Research has shown that even short-term exposure to severe pollution can increase the risk of heart attacks and strokes, particularly in those already prone to heart disease.For healthy adults, this exposure can still cause fatigue, palpitations, or a faster resting heart rate as the body compensates for reduced oxygen intake.What Short-Term Symptoms Should You Watch For Amid High AQI Levels?During periods of poor air quality, experts recommend being alert to subtle but important warning signs. Common short-term symptoms include a dry cough, sore throat, breathlessness while climbing stairs, chest pain, watery eyes, or persistent headaches. Many also experience tiredness or dizziness because of reduced oxygen supply. These may appear mild but are early signs of inflammation and air toxicity.To minimise risk, use an N95 or N99 mask before stepping out, avoid exercising outdoors when pollution levels peak, and consider using an indoor air purifier. Regular lung and heart screenings should no longer be limited to people with existing conditions. Who Is More Vulnerable to Heart Diseases During High AQI?According to the US Environmental Protection Agency, the groups most at risk include children, older adults, pregnant women, individuals with existing heart or lung conditions, and people from economically weaker sections. These populations are more vulnerable due to developing or aging organs, compromised immunity, and higher exposure to pollution, especially among those living near traffic or using solid fuels for cooking and heating.How to Protect Yourself From Air Pollution?1. Track AQI updates using apps like AQI India or AirVisual, or visit the Central Pollution Control Board’s website. On days when AQI levels exceed 200 (considered poor), avoid unnecessary outdoor activity. 2. Get a good air purifier, preferably one with a HEPA filter can help reduce these toxins. Place purifiers in rooms where you spend the most time, such as your bedroom or living area. If multiple devices are not an option, create a single “clean air zone” in one part of your home.3. In today’s pollution levels, masks are no longer optional. Choose N95 or N99 masks, which are specifically designed to block PM2.5 particles, the same ones responsible for thousands of deaths each year.4. Certain indoor plants, like peace lilies, areca palms, and snake plants, can help reduce indoor pollutants naturally. While they can’t replace purifiers, they contribute to better air quality and bring a touch of calm to your space.5. During severe smog, stay indoors as much as possible. If you need to step out, try to do so in the afternoon when pollution tends to ease slightly. Avoid mornings and late evenings, when toxic particles linger close to the ground.6. Include antioxidant-rich foods such as nuts, berries, and leafy vegetables to fight the oxidative damage caused by pollution. Omega-3 fatty acids from fish or flaxseeds are also beneficial for heart and lung health. Drink plenty of water throughout the day as it helps flush out toxins, including those inhaled from polluted air.
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