A new study suggests that prolonged exposure to air pollution may significantly impair memory and cognitive abilities, with effects comparable to a decade of natural aging.
The findings were announced by researchers from UC Davis Health and Kaiser Permanente, who examined the long-term impact of fine particulate matter on brain health.
According to the researchers, pollution generated by forest fires, fossil-fuel power plants, artificial intelligence (AI) data centers, and fuel-intensive vehicles is contributing to declining air quality.
The study warns that these pollutants pose risks not only to the environment but also to human cognitive health.
Twenty years of exposure linked to poorer memory
Researchers found that individuals exposed to high levels of very fine particulate matter over approximately 20 years performed significantly worse on memory assessments.
Participants were tested on their ability to recall facts, words, and general information. Those living in areas with higher pollution levels consistently scored lower than people residing in cleaner environments.
The study found that the cognitive impact of long-term pollution exposure was equivalent to roughly 10 years of natural aging.
Researchers said the decline was particularly evident in semantic memory, which involves remembering words, meanings, concepts, and general knowledge used in everyday life.
Why semantic memory matters
Catherine Conlon, the study's senior author and an associate professor in the UC Davis Department of Public Health Sciences, emphasized the importance of semantic memory.
She said semantic memory plays a critical role in effective communication, understanding language, processing information, and carrying out daily activities.
The findings add to a growing body of evidence linking air pollution to serious health problems beyond respiratory and cardiovascular disease.
Researchers say the study highlights the importance of improving air quality and reducing long-term exposure to harmful pollutants to protect both physical and cognitive health.
