Polluted Air  (1 of 8 photos)

It’s hard enough to pronounce airborne pollutants like nitrogen oxide and sulfur dioxide. Now, imagine breathing them in. Doing so may trigger heart attacks within hours or days, warn experts at the American Heart Association. To reduce your exposure, avoid exercising next to busy roadways or near industrial facilities.

 

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When the heart muscle's blood supply is cut off, heart muscle cells fail to get enough oxygen and begin to die. What is this called?