Graphic: Million Hearts, US Health and Human Services
You may already be aware that heart disease and stroke are the first and fourth leading causes of death in the U.S. But did you know that exposure to air pollution can trigger heart attacks and strokes in populations that are predisposed? Particle pollution, also known as particulate matter, is a frequent, widespread air pollutant. Particulate matter consists of solids or liquids in air that are so tiny, you cannot see them (see graphic for more information). Particulate matter pollution is measured in two sizes: PM10 (less than 10 microns) and PM2.5 (less than 2.5 microns). Common sources of particulate matter are tobacco smoke, automobile and diesel exhaust, and wood smoke. When inhaled, these tiny particles get trapped in the lungs, which can negatively affect the heart and blood vessels.