Global Air: Still Dirty and Deadly
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Air pollution continues to be one of the most serious—and often invisible—threats to human health worldwide, says the State of Global Air Report 2025: A Report on Air Pollution and Its Role in the World’s Leading Causes of Death. The State of Global Air (SoGA) report is widely considered one of the most reliable and authoritative sources of air quality data in the world.
The SoGA 2025 report, published by the Health Effects Institute and the Institute for Health Metrics and Evaluation’s Global Burden of Disease project, says polluted air is not just an environmental issue—it is a major driver of chronic disease, premature death, and reduced quality of life across the globe.
Drawing on 2023 data, the report highlights how exposure to fine particulate matter (PM₂.₅), ozone, and nitrogen dioxide affects billions of people daily.
There is progress: Between 2013 and 2023, 13 countries reduced their average ambient levels of fine particulate matter, while seven countries saw increases. Regarding average annual exposure to nitrogen dioxide between 2013 and 2023, 11 countries improved while nine countries saw increases.
However, globally, the average exposure to ambient ozone pollution has increased steadily since 1990, the report says, adding that “the largest health burdens” are seen in low- and middle-income countries.”
Key Data Points
Almost 8 million deaths in 2023 were linked to air pollution—roughly 1 in every 8 deaths worldwide, making it one of the leading global risk factors for mortality.
Eighty-six percent of those deaths (6.8 million) were caused by noncommunicable diseases (NCDs) such as heart disease, stroke, diabetes, lung disease, and dementia.
Air pollution contributed to 232 million years of healthy life lost globally, reflecting long-term illness and disability—not just early death.
Ninety-five percent of air pollution–related deaths among adults over age 60 are tied to chronic diseases, underscoring pollution’s role in aging-related health decline.
More than 625,000 deaths in 2023 were linked specifically to dementia associated with air pollution; dementia is a newly added category in this year’s report.
Thirty-six percent of the global population is exposed to PM₂.₅ levels above even the least strict international guideline (35 μg/m³).
Nearly 2.6 billion people (about one-third of humanity) are still exposed to household air pollution from burning solid fuels like wood, charcoal, and dung for cooking.
Ambient PM₂.₅ alone accounts for about 4.9 million deaths, making it the single largest air pollution risk factor.
Low- and middle-income countries bear the greatest burden, accounting for roughly 90% of air pollution deaths, due to higher exposure and fewer health protections.
Why It Matters
Air pollution is no longer just about smoggy skies—it is deeply intertwined with the global rise of chronic diseases. The report makes clear that tackling air pollution could significantly reduce rates of heart disease, diabetes, dementia, and other major illnesses.
At the same time, solutions are well known: cleaner energy, improved cooking technologies, stricter emissions standards, and better urban planning. The challenge is scaling these solutions quickly and equitably—especially in regions where the health stakes are highest.
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