Smoke and Air Quality Update: Prescribed Burns and Mop-Up Activity Create Localized Concerns

With the 2026 active wildfire season winding down in the Pacific Northwest, the regional air quality story is shifting — from the dense, multi-day smoke events that blanketed the region during peak fire season, to more localized smoke impacts from ongoing mop-up operations and the launch of fall prescribed burning across Oregon and Washington.

Current Air Quality Conditions

As of October 8, 2026, air quality across most of the Pacific Northwest has improved significantly compared to the hazardous and very unhealthy conditions that gripped the region during August and September. Seattle's Air Quality Index (AQI) ranged between 36 (Good) and 55 (Moderate) on October 7, reflecting primarily local urban pollution with minimal wildfire smoke contribution.

However, conditions vary considerably by location. Communities downwind of active mop-up operations on the Little Giant, Sisi, Grasshopper, and Austin fires may experience moderate to unhealthy smoke concentrations — particularly in low-lying areas and river valleys where cool air settles overnight, trapping smoke below the inversion layer.

Prescribed Burns Add to Smoke Load

The launch of the BLM and U.S. Wildland Fire Service's fall prescribed burn season on October 1st will add periodic smoke events across Oregon and Washington through the winter. While prescribed burn smoke is generally more predictable and shorter-duration than wildfire smoke, people with respiratory conditions should remain vigilant.

Smoke from prescribed burns tends to be most noticeable:

During burn days, downwind of active treatment units
Overnight and in early morning, when inversions trap smoke in valleys
In rural communities near BLM and Forest Service lands where treatment units are concentrated

Who Is Most at Risk?

Wildfire and prescribed burn smoke contains fine particulate matter (PM2.5) that penetrates deep into the lungs. Those most vulnerable to smoke health effects include:

Children and teenagers
Adults over 65
People with asthma, chronic obstructive pulmonary disease (COPD), or other lung conditions
People with heart disease or diabetes
Pregnant women

How to Protect Yourself

Check AirNow.gov for current and forecast AQI in your area before outdoor activity
Use air purifiers with HEPA filters indoors during smoke events
Wear an N95 respirator if you must be outdoors during elevated smoke conditions — cloth masks do not filter fine particles
Limit strenuous outdoor exercise when AQI is above 100 (Unhealthy for Sensitive Groups)
Keep windows closed overnight to prevent smoke from settling into your home

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