A study of people living in China indicates that chronic exposure to extreme levels of air pollution is associated with poorer cognitive functioning, at any age.
Air pollution may harm cognitive intelligence, study says. London: BBC Health News, August 28th 2018.
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Zhang, X. Chen, X. [and] Zhang, X. (2018). The impact of exposure to air pollution on cognitive performance. Proceedings of the National Academy of Sciences of the United States of America (PNAS). August 27th 2018. [Epub ahead of print].