The American Heart Association is warning that the convergence of wildfire smoke drifting from Canadian fires and soaring summer temperatures across parts of the U.S. poses a particularly dangerous threat to cardiovascular health. In a statement released Thursday, the organization emphasized that the combination of extreme heat and air pollution from wildfires can trigger serious heart events, even in people without known health conditions.
“Extreme heat and wildfire smoke each carry major risks, especially for people with chronic health conditions including heart disease. The combination of the two is extremely dangerous,” said Dr. Manesh R. Patel, volunteer president of the American Heart Association and chief of cardiology at Duke University School of Medicine. “We want people to be mindful of the increased risk and take steps to protect themselves and their loved ones.”
While respiratory issues are often the primary concern with wildfire smoke, Dr. Patel stressed the significant impact on cardiovascular health. Wildfire smoke contains fine particulate matter that is linked to cardiovascular risk. A study published in Circulation, the association’s flagship journal, found that the risk of fatal heart attacks nearly doubled during days with extreme heat and high levels of fine particle pollution, with risks even greater for women and older individuals.
Additional research published in the Journal of the American Heart Association linked heavy wildfire smoke exposure to a 70% increase in out-of-hospital cardiac arrests, affecting men and women, adults aged 35-64, and communities with lower socioeconomic status. Previous findings also associated wildfire smoke with increased emergency room visits for ischemic heart disease, irregular heart rhythm, heart failure, pulmonary embolism, and stroke.
To reduce risks, the American Heart Association recommends staying indoors with doors and windows closed, using high-efficiency air filters, and limiting outdoor activity, especially between noon and 3 p.m. when temperatures peak. Wearing a mask outdoors, staying hydrated with water (avoiding alcohol and caffeine), and wearing lightweight, light-colored clothing are also advised. It is crucial to check on older adults and those with chronic conditions, as they are more vulnerable.
Recognizing signs of a heart attack—such as chest discomfort, shortness of breath, or pain in the upper body—and calling 911 immediately is critical. Heat stroke symptoms, including a body temperature above 103°F and confusion, also require emergency attention. The association also highlights that knowing CPR can double survival chances for cardiac arrest.
Dr. Patel recommends checking local air quality at AirNow.gov and staying informed about health department alerts. “Protect yourself, be alert and prepared,” he said. “It could be the difference in saving your life or that of someone you love.”
For more information, visit heart.org.
