Car fumes 'raise heart attack risk

Breathing in heavy traffic fumes can trigger a heart attack, say UK experts.
Heart attack risk is raised for about six hours post-exposure and goes down again after that, researchers found.
They say in the British Medical Journal that pollution probably hastens rather than directly cause attacks.
But repeated exposure is still bad for health, they say, substantially shortening life expectancy, and so the advice to people remains the same - avoid as far as is possible.
Prof Jeremy Pearson, associate medical director at the British Heart Foundation, which co-funded the study, said: "This large-scale study shows conclusively that your risk of having a heart attack goes up temporarily, for around six hours, after breathing in higher levels of vehicle exhaust."

Source  - BBC