It’s not just the smog that clouds India’s skyline — it’s a deadly mix of toxic air silently shortening lives. A new global report has revealed that air pollution is now responsible for nearly nine out of ten deaths linked to noncommunicable diseases (NCDs) such as heart disease, stroke, diabetes, cancer, and chronic respiratory illness.

According to the State of Global Air (SoGA) 2025 report, released by the Health Effects Institute (HEI) in collaboration with the Institute for Health Metrics and Evaluation and the NCD Alliance, 7.9 million people worldwide died due to air pollution in 2023, with 6.8 million of these deaths caused by NCDs. The majority of these tragic losses occurred in low- and middle-income countries — and India is right at the center of this crisis.

India consistently ranks among the countries with the worst air quality in the world, with cities like Delhi, Ghaziabad, and Lucknow often topping global pollution charts. 

The report points out that South Asia, North Africa, and parts of Africa are bearing the heaviest burden of toxic air. Experts say the tiny, invisible particles known as PM2.5 — produced by vehicle emissions, industrial waste, stubble burning, and fossil fuel combustion — are the main culprits.

These particles penetrate deep into the lungs and bloodstream, triggering inflammation that damages the heart, brain, and other organs. “People think air pollution only affects breathing, but in reality, it poisons almost every part of the body,” said Dr. Pallavi Pant, Head of Global Initiatives at HEI. “From heart attacks to strokes and even dementia, the impact is far more devastating than most realize.”

The report shows that between 2000 and 2023, global NCD deaths linked to air pollution rose by 13 percent, with nearly a million more deaths during this period. Half of all chronic respiratory disease deaths and one in four heart disease deaths were attributed to air pollution exposure.

India alone contributes significantly to these figures. Experts estimate that one in three premature deaths in India can be traced back to polluted air, making it a leading risk factor for heart attacks and strokes. The World Health Organization’s air quality guideline for PM2.5 is 5 micrograms per cubic meter — yet Delhi’s winter average often exceeds 100 micrograms, twenty times the safe limit.

For the first time, the SoGA report has also linked air pollution to dementia, showing that more than 625,000 people died globally in 2023 from pollution-related cognitive decline, with Asia contributing a significant share. “This should be a wake-up call,” warned Dr. Maria Neira, former WHO Director for Public Health and Environment. “Cleaner air means a healthier brain, heart, and life expectancy.”

Beyond the health toll, polluted air is choking India’s economy and households. Diseases caused by air pollution result in high hospital admissions, loss of productivity, and mounting medical bills. Families caring for patients with chronic illnesses or dementia bear emotional and financial strain — with women disproportionately affected as caregivers.

“Air pollution doesn’t just kill; it steals quality years of life,” said Alison Cox, Policy and Advocacy Director at the NCD Alliance. “The link between polluted air and diseases like heart failure or diabetes shows that clean air policies are not just environmental — they are lifesaving health policies.”

The Indian government has launched several initiatives, including the National Clean Air Programme (NCAP), which aims to reduce PM2.5 and PM10 levels by 40% by 2026 across more than 130 cities. Measures such as the switch to cleaner fuels, electric mobility, and stubble management programs are steps in the right direction. However, experts stress that implementation and accountability remain key.

“India’s challenge isn’t policy — it’s enforcement and awareness,” noted Dr. Pant. “We’re seeing progress, but it’s too slow for the scale of the crisis.”

The report urges urgent global and local action, emphasizing that air pollution must be treated as a public health emergency. Experts believe that tackling it can deliver “win-win” outcomes — improving health, mitigating climate change, and boosting economic resilience.

As Dr. Neira put it, “Every breath we take should sustain life, not shorten it. The right to clean air is not optional — it’s fundamental.”

India, home to 1.4 billion people, cannot afford to ignore this invisible killer. 

The fight for clean air is no longer just about clearer skies — it’s about protecting hearts, saving brains, and giving future generations a fair chance to breathe freely.