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Is wildfire smoke dangerous to your health?

Dr. Colin Little

Dr. Colin Little

MD, FAWM, Chief Medical Officer, GOES Health

The short answer

It can be. Wildfire smoke can be a real health hazard, not just a nuisance. Its fine particles (PM2.5) reach deep into your lungs and can worsen asthma and heart and lung conditions, and at high levels bring on coughing and trouble breathing. For most healthy people, limited exposure isn't a problem, but people with heart or lung disease, children, older adults, and pregnant people need to be careful.

Wildfire smoke is more than a bad smell. It can genuinely harm your health. Its fine particles, known as PM2.5, are the main pollutant of concern.1 Each is roughly a thirtieth the width of a human hair, small enough to reach deep into your lungs, and some can even get into your bloodstream.2

How much it affects you depends on the levels and on your health. Short-term, the effects range from minor ones like burning eyes and an irritated throat to serious ones like worsening of asthma, COPD, or heart failure. 1At high levels, the particles bring on persistent coughing, phlegm, wheezing, and trouble breathing.1

Most healthy people recover quickly once the air clears, while the bigger danger falls on people with heart or lung disease, children, older adults, and pregnant people.1 For those groups, a smoky stretch is worth taking seriously.

So give a smoky day the same caution you'd give any health hazard. Check your local air quality and limit your time outside, especially if you're in one of those groups. Let your symptoms guide you, and if breathing gets hard or a cough won't stop, get to cleaner air.

Sources

  1. [1] U.S. EPA / USFS / CDC / CAPCOA / NPS / CARB. Wildfire Smoke: A Guide for Public Health Officials (Revised 2026). June 2026. Accessed August 6, 2026. https://www.epa.gov/system/files/documents/2026-06/wildfire-guide-for-public-health-officials-2026.pdf
  2. [2] U.S. EPA. Particulate Matter (PM) Basics. Accessed August 6, 2026. https://www.epa.gov/pm-pollution/particulate-matter-pm-basics

About the author

Dr. Colin Little

Dr. Colin Little

MD, FAWM, Chief Medical Officer, GOES Health

  • Board Certified Emergency Physician
  • Fellow of the Academy of Wilderness Medicine (FAWM)
  • Wilderness Medicine Fellowship, University of Utah
  • Emergency Medicine Residency and Chief Resident, Stanford / Kaiser
  • Doctor of Medicine, University of Arizona College of Medicine – Phoenix
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