Air Pollution Linked to One in Seven Deaths in Delhi During 2023: Study

Air Pollution Caused Nearly 15% of All Deaths in Delhi in 2023, Says Study.

Air pollution was responsible for nearly 15 per cent of all deaths in Delhi in 2023, making it the city’s single biggest health threat, according to a new analysis of Global Burden of Disease (GBD) data.

The study, conducted by the Centre for Research on Energy and Clean Air (CREA) using data released by the Institute for Health Metrics and Evaluation (IHME), found that about 17,188 deaths in the national capital last year were linked to long-term exposure to particulate matter (PM2.5). This translates to roughly one in every seven deaths in Delhi being caused by toxic air.

Union Government Downplays Findings
Despite the alarming statistics, the Union Environment Ministry has maintained that there is “no conclusive evidence” directly linking air pollution to mortality, calling it one of several contributing health factors.

‘A Public Health Emergency’

• Researchers at CREA said the findings underscore the urgent need to treat air pollution as a public health emergency rather than just an environmental concern.
• “Air pollution must now be treated foremost as a public health issue, not merely an environmental one,” said Dr Manoj Kumar, analyst at CREA.
• “India already has over 250 epidemiological studies showing the clear connection between air pollution and a range of diseases. The science is settled — what’s needed is decisive, coordinated action,” he added.

Dr Kumar explained that PM2.5 pollution affects far more than the lungs. “Fine particles enter the bloodstream, reducing oxygen supply to the heart and brain. Over time, this can lead to heart attacks, strokes, and chronic illnesses,” he said.

Deaths Continue to Rise Despite Interventions
The GBD data shows that deaths linked to air pollution in Delhi rose from 15,786 in 2018 to 17,188 in 2023 — despite multiple air quality management plans. In comparison, deaths caused by high blood pressure, diabetes, and high cholesterol remained lower than those attributed to air pollution.

Following air pollution, the top risk factors for mortality in Delhi last year were high systolic blood pressure (12.5%), high fasting plasma glucose (9%), high cholesterol (6%), and obesity (5.6%).

Pollution Not Just a Winter Problem
Experts stressed that Delhi’s air quality crisis extends beyond the winter months.
“Pollution is not seasonal — exposure occurs throughout the year. It only appears worse in winter when wind speeds drop,” Dr Kumar said.

According to CREA’s latest assessment, Delhi ranked sixth among India’s most polluted cities in October 2025, recording an average PM2.5 concentration of 107 µg/m³ — nearly three times higher than in September. Dharuhera in Haryana topped the list with 123 µg/m³.

Interestingly, stubble burning accounted for less than 6% of Delhi’s October PM2.5 levels, indicating that local sources such as vehicular emissions and industries remain the major contributors.

‘Strong Regulation Is the Key’
Dr Kumar said that while public awareness is important, only strong policy enforcement can bring lasting change. “Nearly half of Delhi’s air pollution comes from vehicles. Public cooperation helps, but large-scale improvements require strong government regulation and strict enforcement,” he noted.