Even before a major fire breaks out nearby, smoke from distant wildfires can blanket Oregon, Washington, and Idaho communities for days or weeks at a time. With conditions pointing toward an active 2026 fire season, public health officials and air quality agencies are urging residents to understand smoke risk and prepare to protect themselves and their families.

Why Wildfire Smoke Is Dangerous

Wildfire smoke is a complex mixture of gases and fine particles produced when wood and other organic materials burn. The most dangerous component is PM2.5 — fine particulate matter 2.5 microns or smaller in diameter, roughly 30 times smaller than the width of a human hair. These tiny particles can penetrate deep into the lungs and enter the bloodstream, triggering a range of health effects:

  • Coughing, wheezing, and shortness of breath
  • Eye, nose, and throat irritation
  • Aggravation of asthma, COPD, and other respiratory conditions
  • Increased risk of heart attack and stroke during prolonged exposure
  • Reduced immune function and increased susceptibility to respiratory infections

Children, the elderly, pregnant women, and those with pre-existing heart or lung conditions are most vulnerable. Even healthy adults can experience symptoms during heavy smoke events.

How to Check Air Quality

The Air Quality Index (AQI) is the standard measure used to communicate how clean or polluted outdoor air is. Key reference points:

  • 0–50 (Good): Air quality is satisfactory. Outdoor activities are fine.
  • 51–100 (Moderate): Acceptable for most, but sensitive individuals should limit prolonged outdoor exertion.
  • 101–150 (Unhealthy for Sensitive Groups): Sensitive groups should reduce prolonged outdoor activity. Others are unlikely to be affected.
  • 151–200 (Unhealthy): Everyone may begin to experience health effects. Sensitive groups should avoid outdoor activity.
  • 201–300 (Very Unhealthy): Health alert — everyone should avoid prolonged outdoor exertion.
  • 301+ (Hazardous): Health emergency. Stay indoors.

Monitor air quality in real time at AirNow.gov, the Washington Department of Ecology's air quality map (ecology.wa.gov), or the Oregon Department of Environmental Quality's AQI tool (oregon.gov/deq).

Protecting Yourself During Smoke Events

  • Stay indoors during heavy smoke events and keep windows and doors closed
  • Run your HVAC on recirculate — do not bring outside air in
  • Use a HEPA air purifier in at least one room to create a cleaner air shelter
  • Wear an N95 or P100 respirator if you must be outside — cloth masks and surgical masks do not filter PM2.5 effectively
  • Avoid vigorous outdoor exercise when AQI is above 100
  • Check on neighbors, especially the elderly or those without air conditioning

What to Expect in 2026

During the severe smoke events of 2020 and 2021, AQI values in parts of Oregon and Washington reached hazardous levels for multiple consecutive days, shutting down schools, outdoor events, and construction. Smoke transported from fires in California, British Columbia, and across the interior West can significantly degrade air quality in coastal communities that are far from any active fire.

As the 2026 season shapes up to be above average in fire activity, air quality managers across the Northwest are preparing public communication plans and encouraging residents to stock up on N95 masks and air purifier filters before demand peaks. Acting now — while stores are still fully stocked — is far easier than scrambling during a regional smoke event.