Bigger picture
Commenting on the study, published in the journal, Heart, the British Heart Foundation said previous studies had shown air pollution could make existing heart and circulatory conditions, including heart attacks, worse in vulnerable people.
"This research adds weight to what we already know, but goes further to suggest a link between air pollution and an increased risk of blood clots in the lungs and heart rhythm atrial fibrillation(心房纤颤)," said Julie Ward, senior cardiac nurse.
"But, as with many studies, we do need to look at the bigger picture and, although this is a large comprehensive study, it did have its limitations.
"We do, therefore, recognise that further research into exactly how air pollution particles affect the cardiovascular system needs to be carried out."
Seven million people died as a result of air pollution in 2017, according to World Health Organization estimates.
Its findings suggest a link between air pollution and heart disease, respiratory problems and cancer.
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