Patients with heart disease have an increased risk of having a serious heart attack even during moderate air quality days, according to findings released last week by Intermountain Heart Institute. Kent Meredith, a cardiologist with Intermountain Medical Center in Murray and one of the researchers on the study, said the risk begins when the level of fine particulate matter – what scientists call PM2.5 – reaches 25 micrograms per cubic meter of air.
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