空气质量影响大脑认知

 

Elderly people living in areas of high air pollution have brains that are 'three years older' as cognitive¹ function is affected² by air quality, a study has found for the first time.

 

Researchers found that elderly people did worse on thinking tests if they lived in areas with high levels of air pollution, compared to those in areas with relatively³ clean air.

 

The team from University of southern California presented their findings at the Gerontological Society of America's annual scientific meeting, in San Diego.

 

Postgraduate⁴ doctoral fellow Jennifer Ailshire conducted the analysis using data from the American Environmental Protection Agency and the Health and Retirement⁵ Study.

 

She said: "As a result of age-related declines in health and functioning, older adults are particularly vulnerable to the hazards（危害，障碍） of exposure to unhealthy air.

 

"Air pollution has been linked to increased cardiovascular（心血管的） and respiratory（呼吸的） problems, and even premature⁶ death, in older populations, and there is emerging evidence that exposure to particulate⁷ air pollution may have adverse⁸ effects on brain health and functioning as well."

 

The study of 14,793 men and women aged⁹ over 50 matched their results on cognitive tests to maps of air pollution.

 

The association even remained after accounting¹⁰ for several factors, including age, race/ethnicity, education, smoking behavior, and respiratory and cardiovascular conditions.

 

Every ten micrograms of fine particle air pollution found per cubic meter was linked to a drop of a third of a point in cognitive scores.

 

Areas of low air pollution had 4.1 micrograms per cubic meter and areas with the worst had 20.7 micrograms.

 

The difference was the equivalent of ageing three years, Ms Ailshire said.

 

This was because one year increase in age was linked to a drop in cognitive scores of just over a tenth of a point.

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