WHY air pollution causes lung disease is obvious. Why it also causes heart disease is, though, a conundrum. One suggestion is that tiny particles of soot migrate through the lungs, into the bloodstream and thence to the walls of blood vessels, where they cause damage. Until now, this has remained hypothetical. But a study published in ACS Nano, by Mark Miller of Edinburgh University, suggests not only that it is correct, but also that those particles are specifically carried to parts of blood vessels where they will do maximum damage-the arterial plaques associated with cardiovascular disease.
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