Doctors are warning that two environmental hazards are becoming a dangerous combination for heart health.
Wildfire smoke drifting across large areas and record-breaking summer heat may work together to greatly increase the risk of heart attacks, strokes, and sudden cardiac arrest.
The warning comes from the American Heart Association and is supported by research published in Circulation and the Journal of the American Heart Association.
Wildfires release enormous amounts of smoke filled with microscopic particles. These particles are invisible to the eye but can easily be breathed deep into the lungs.
Once inside the body, they may trigger inflammation and place extra stress on the heart and blood vessels.
Heat creates another challenge. On very hot days, the body must send more blood to the skin to release heat, forcing the heart to pump harder. People can also become dehydrated, making it more difficult for the heart to work efficiently.
When smoke and heat occur together, the risks appear to increase. Scientists found that deaths from heart attacks rose sharply during periods when both extreme temperatures and high levels of fine air pollution occurred at the same time. The danger was particularly high for women and older people.
Another large study showed that exposure to dense wildfire smoke increased the chance of suffering a cardiac arrest outside hospital by up to 70 percent. Researchers also reported more hospital visits for heart failure, abnormal heart rhythms, stroke, and other cardiovascular diseases during smoke events.
These findings matter because wildfire smoke does not stay close to the flames. Winds can carry polluted air across states and even countries, exposing millions of people who may never see the fire itself. Many people may not realize they are breathing unhealthy air until symptoms begin.
Experts recommend checking local air quality reports before spending time outdoors. If smoke levels are high, stay indoors as much as possible, keep windows closed, and use air filtration if available. Outdoor exercise should be postponed until air quality improves.
People should also protect themselves from the heat by drinking water regularly, avoiding alcohol when outdoors, wearing loose light-colored clothing, and staying in cool places during the hottest hours of the day. Looking after elderly relatives, neighbors, and pets is equally important because they may struggle to cope with both heat and smoke.
Knowing the warning signs of heart attack, stroke, and heat stroke can save lives. Anyone with chest pain, sudden weakness, confusion, severe shortness of breath, or collapse should receive emergency medical care immediately.
The overall message from this research is clear. Although individuals cannot control the weather or wildfire smoke, they can reduce their exposure and lower their risk.
The evidence comes from several large studies rather than a single investigation, making the advice especially persuasive. With wildfires and heat waves becoming more common, public awareness and early action will play an increasingly important role in protecting heart health.
If you care about heart health, please read studies about how eating eggs can help reduce heart disease risk, and Vitamin K2 could help reduce heart disease risk.
For more health information, please see recent studies about how to remove plaques that cause heart attacks, and results showing a new way to prevent heart attacks, strokes.
