Man selling papers while wearing smog mask in Mexico City
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Could air pollution cause brain damage?

5 September 2016 Last updated at 23:26 BST

Tiny particles of pollution - inside samples of brain tissue - could be contributing to diseases such as Alzheimer's, according to new research.

The study, led by scientists at Lancaster University, raises a host of new questions about the health risks of air pollution.

Our Science Editor David Shukman assesses its findings.

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