Breathing in air pollution from traffic fumes can raise the risk of potentially deadly blood clots, a US study says.Exposure to small particulates - tiny chemicals caused by burning fossil fuels - is known to increase the chances of heart disease and stroke.
But the Harvard School of Public Health found it also affected development of deep vein thrombosis - blood clots in the legs - in a study of 2,000 people.
Researchers said the pollution made the blood more sticky and likely to clot.
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