Wildfire smoke from dozens of active fires across Washington, Oregon, and Idaho continues to impact air quality throughout the Pacific Northwest as the 2026 fire season enters its final weeks. While some urban areas have recently seen moderate conditions, health officials warn that smoke events can intensify rapidly — especially with new fire activity like the Spokane Complex generating massive amounts of smoke across eastern portions of both states.

Current Air Quality Conditions

As of early September, air quality monitors across the Northwest show variable conditions heavily influenced by wind patterns, fire activity, and overnight temperature inversions that can trap smoke at ground level in valleys and populated corridors.

  • Seattle, WA: AQI peaked at 58 (Moderate) on September 6, with some improvement since
  • Eugene, OR: AQI approximately 42 (Good) as of September 7
  • Forest Grove, OR: AQI peaked at 58 (Moderate) on September 7
  • Eastern Oregon / Eastern Washington: More variable and more impacted; smoke from the Spokane Complex and ongoing fires in Idaho has caused periods of Unhealthy for Sensitive Groups readings in the Spokane Valley and across portions of the Columbia Basin
  • Joseph, OR: AQI approximately 24 (Good) as of September 8, reflecting favorable wind patterns for that area

Who Is Most at Risk

Fine particulate matter (PM2.5) from wildfire smoke is the primary health concern. Even at Moderate AQI levels, certain populations face elevated health risk from smoke inhalation:

  • Children and infants, whose lungs are still developing
  • Adults 65 and older
  • People with asthma, COPD, heart disease, or other chronic respiratory or cardiovascular conditions
  • Pregnant women
  • Outdoor workers with extended exposure during smoky conditions

How to Protect Yourself

Public health officials from Oregon Health Authority and the Washington State Department of Health recommend the following steps when wildfire smoke is present:

  • Stay indoors with windows and doors closed when AQI reaches Unhealthy for Sensitive Groups (101+) or higher
  • Use HEPA-rated air purifiers indoors if available; even a box fan with a MERV-13 furnace filter can provide meaningful particulate reduction
  • Wear a well-fitted N95 or KN95 respirator if you must go outdoors during smoky conditions — cloth masks offer minimal protection from PM2.5
  • Avoid vigorous outdoor exercise on smoky days; save outdoor activities for mornings when smoke concentrations are often lowest
  • Keep car windows closed and set air conditioning to recirculate rather than drawing in outside air

Where to Check Air Quality

  • AirNow.gov — Real-time AQI data and forecasts for locations across the U.S.
  • Oregon Smoke Blog — oregonsmoke.blogspot.com — Daily Oregon-specific smoke and air quality analysis
  • Oregon State Fire Marshal Interactive Maps — osfminfo.org/maps — AQI layer alongside evacuation maps
  • Washington Ecology Air Monitoring — ecology.wa.gov

Outlook

With multiple active fires still burning across the Northwest and the region in the midst of a historically severe fire season, air quality forecasters expect intermittent smoke impacts to continue through at least late September. Incoming fall weather systems will periodically clear smoke from populated areas, but these same systems — especially before precipitation arrives — can produce the strong wind events that drive dangerous fire behavior.