Older women who live in areas where the fine particulate matter (2.5 micrometers or smaller in diameter) exceeds the limits set by the United States Environmental Protection Agency had an 81 percent greater chance of general cognitive decline and were 92 percent more likely to develop dementia.

This recently published paper in Translational Psychiatry, by researchers at the University of Southern California, adds to an emerging body of research linking air pollution to dementia.

(Photo: David Mark)