Longevity & AgingHow Air Pollution Accelerates Biological Aging at the Molecular Level
Air pollution is now recognized not just as a cause of organ-specific disease but as a direct accelerant of biological aging itself. This comprehensive review synthesizes epidemiological and mechanistic evidence showing that fine particulate matter (PM2.5), ultrafine particles, and traffic-related emissions disrupt core hallmarks of aging — including oxidative stress, chronic inflammation, telomere shortening, mitochondrial dysfunction, epigenetic dysregulation, and cellular senescence. Among aging biomarkers, composite system-level measures such as PhenoAge, Klemera-Doubal biological age, and frailty scores show the strongest and most consistent links to pollution exposure. Epigenetic clock findings remain mixed. Critically, biological aging appears to be a mechanistic pathway through which pollution drives cardiovascular disease, neuropsychiatric conditions, and kidney disease. Encouragingly, air quality improvements and clean cooking fuel transitions can partially reverse pollution-driven aging acceleration.
