Pollution 'hinders heart pacing'

From The BBC: "Air pollution from traffic hinders the heart's ability to conduct electrical signals, a study has suggested. Exposure to small particulates - tiny chemicals caused by burning fossil fuels - caused worrying changes on the heart traces of 48 heart patients. Particulate pollution is already known to increase heart attack risk. The Circulation study appears to back this up and the heart trace changes seen were characteristic of poor oxygen supply to the heart. According to the World Health Organization, air pollution accounts for three million deaths worldwide every year"