People who live in close proximity to high-traffic roadways appear to have a higher risk of dementia than those who live farther away, say researchers, suggesting that air pollution from vehicles may be a factor in the development of the neurological disease.

In a study published in this week’s Lancet, researchers found that Ontario residents who lived within 50 metres of a highway or major road had a seven per cent increased likelihood of developing dementia compared to those who lived more than 300 metres away from such busy transportation routes. That…