From The Telegraph:

Scientists have found living in areas with high levels of traffic pollution can reduce people’s performance in cognitive tests.

They found that people older than 51 who had lived in polluted areas had lower cognitive scores than those who had been exposed to lower levels of pollution during their life time even after their results had been adjusted for social and educative status.

A second study in animals has also revealed that fine airborne particulates that are typically emitted by diesel engines can lead to learning and memory problems by reducing the growth of neurons in the brain.

Dr Melinda Power, from the department of epidemiology and environmental health at the Harvard School of Public Health in Boston, Massachusetts, said that long term exposure to air pollution related to traffic seemed to affect the way the brain functions.

She said: “Cognitive decline and impairment in the elderly is a huge public health issue. Our study suggests that traffic-related air pollution, particularly diesel exhaust, may play a role.

“Our results suggest an adverse effect of traffic related air pollution on global cognitive function in older men.

“When we explored the potential for effect modification, our results suggest the effect of traffic-related air pollution on cognition may be greater in smokers or overweight and obese individuals.

“Although we looked at the effect in men, I believe the findings are applicable to women as well.”

The study examined the average lifetime exposure to traffic-related pollution and the cognitive test scores of 680 men aged between 51-years-old and 97-years-old.

It found that those living in areas that were exposed to twice as much black carbon as low pollution areas were 1.3 times more likely to have lower cognitive scores.

More.

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