The American Heart Association is alerting the public that the combination of wildfire smoke drifting from Canadian wildfires and soaring summer temperatures poses a serious threat to cardiovascular health. In a statement released July 16, 2026, the organization emphasized that while respiratory issues are often the primary concern with smoke exposure, the cardiovascular impact can be equally severe, particularly for individuals with existing heart 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.”
Wildfire smoke contains fine particulate matter that can enter the bloodstream and trigger cardiovascular events. A study published in Circulation, the American Heart 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. The risks were even greater for women and older individuals.
Additional research has linked smoke exposure to increased rates of sudden cardiac arrest and emergency room visits for cardiovascular conditions. A study in the Journal of the American Heart Association reported that heavy smoke exposure during wildfires raised the risk of out-of-hospital cardiac arrests by up to 70%, affecting both men and women, adults aged 35-64, and communities with lower socioeconomic status.
Dr. Patel advises several precautions to reduce exposure. Staying indoors with windows and doors closed is recommended, along with using high-efficiency air filters or portable air cleaners, which can reduce indoor particulate matter by 50-60%, according to the American Heart Association’s 2020 scientific statement on air pollution exposure. If a home lacks air conditioning and becomes too warm, seeking alternative shelter is advisable.
When outdoor activity is unavoidable, limiting exertion, taking breaks in shaded or cool areas, and staying hydrated with water while avoiding alcohol and caffeine can help. Wearing lightweight, light-colored clothing, hats, sunglasses, and sunscreen is also recommended. Checking on older adults and those with chronic conditions—as well as pets—is crucial, as they are more vulnerable.
Recognizing signs of a heart attack or stroke is vital. Symptoms include chest discomfort, pain in the arms, back, neck, jaw, or stomach, shortness of breath, cold sweats, nausea, rapid or irregular heartbeat, unusual fatigue, or lightheadedness. Heat stroke, another medical emergency, presents with a body temperature above 103°F, hot red skin, rapid pulse, confusion, or loss of consciousness. In either case, calling 911 immediately is essential.
The U.S. Environmental Protection Agency offers a zip code-level air quality tracking map at airnow.gov, which Dr. Patel recommends checking regularly. Staying informed about local health department alerts is also important. “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, the American Heart Association provides resources at heart.org.
