MAHARASHTRA, INDIA - Scientists are uncovering a hidden consequence of air pollution: it harms the brain, not just the lungs and heart.
Large studies across Asia, the US, and Europe link long-term exposure to higher risks of depression, anxiety, and cognitive decline. Roughly 99% of the global population breathes air exceeding the World Health Organization's safety guidelines.
In India, a 2025 analysis of 359 people found those living near coal-fired power plants reported more stress and anxiety. Women are particularly affected due to household air pollution from biomass cooking fuels.
Rukmini Manjare, 54, stopped working in sugarcane fields due to anxiety tied to hazy, polluted days. Her symptoms include elevated blood pressure and constant worry.
A December 2025 analysis of 23.7 million older adults in the US found PM2.5 exposure linked to late-life depression, echoing findings in Europe.
At the cellular level, PM2.5 particles can cross the blood-brain barrier and cause neuroinflammation. Lab studies show damage to brain cells, disrupting mood chemicals like dopamine.
Animal studies confirm a causal link: mice exposed to high pollution exhibited depression-like behaviors.
Scientists say the clearest solution is reducing pollution at the source through policy changes, including cutting emissions of sulfur dioxide, nitrogen oxides, and ammonia, and expanding green spaces.