From the EPA: > Health effects of wood smoke > The biggest health threat from smoke is from fine particles, also called fine particulate matter or PM2.5. Thes

From the EPA: > Health effects of wood smoke > The biggest health threat from smoke is from fine particles, also called fine particulate matter or PM2.5. These microscopic particles can get into your eyes and respiratory system, where they may cause burning eyes, runny nose, and illnesses, such as bronchitis. > Fine particles can make asthma symptoms worse and trigger asthma attacks. Fine particles can also trigger heart attacks, stroke, irregular heart rhythms, and heart failure, especially in people who are already at risk for these conditions. https://www.epa.gov/burnwise/wood-smoke-and-your-health#health https://www.epa.gov/burnwise/wood-smoke-and-your-health#heal...