Ronald Grisanti D.C., D.A.B.C.O., M.S.

New study soon to be published in the medical journal, Circulation finds that pedalling to the office along congested roads can cause significant damage to blood vessels, increasing the risk of heart disease.

The study has found that breathing diesel exhaust fumes damages the heart by making the blood vessels stiff and hard.

Diesel exhaust includes tiny particles of carbon and a range of metals.

The particulates are so small that experts say it is pointless for cyclists to wear masks, because the mesh cannot be fine enough to block them.

According to Dr David Newby, British Heart Foundation senior lecturer in cardiology at Edinburgh University, cycling through congested traffic may simply be bad for the heart.

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