Air pollution increases the risk of a serious heart attack for those who have heart disease, a new study suggests.
Researchers examined data on thousands of people treated for heart attack in and around Salt Lake City between 1993 and 2014. Their aim was to see how air pollution affects heart attack risk and which type of heart attack in particular.
The study found a strong association between bad air quality -- above 25 micrograms of fine particulate matter per cubic meter of air -- and increased risk of STEMI heart attack, the most dangerous type of heart attack. But the study did not prove that poor air quality causes this type of heart attack.
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