The way that even low levels of carbon monoxide can be fatal, by disrupting the heart's rhythm, has been unravelled by researchers in Leeds.
They found that levels common in heavy traffic could affect the way the heart resets itself after every beat.
Their study in the American Journal of Respiratory and Critical Care Medicine showed a common angina drug may reverse the effect.
The British Heart Foundation said the research was a promising start.
Carbon monoxide is produced by faulty boilers, cigarettes and car exhausts.
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