A new Canadian study connects dementia to heavy traffic. The study, published in the renowned time journal The Lancet, followed 6.6 million Canadians over a period of ten years.

It shows that those who lived 50-100 meters from a highway had four percent higher risk of developing dementia compared with those who did not. For those who lived 100-200 meters from the highway, the risk of developing dementia increased by two percent.

The compound was detected even when factors such as social status, smoking, BMI and education level were taken into account.

(Photo: Hilton Holloway)