2026 Wildfire Smoke Season in Review: Pacific Northwest Communities Saw Historic Air Quality Impacts

As the 2026 wildfire season officially comes to a close across the Pacific Northwest, state air quality agencies and public health officials are conducting a sobering review of this year's smoke impacts. Communities across Oregon, Washington, and Idaho endured some of the worst air quality episodes in a generation — in some cases breaking records that go back 20 or more years of monitoring data.

Washington Ecology's Season-End Air Quality Review

The Washington State Department of Ecology has released a preliminary review of the 2026 wildfire season's air quality impacts. The data shows that several counties recorded their highest levels of smoke exposure in more than 20 years of monitoring. While smoke during Eastern Washington summers is not unusual, the 2026 season delivered concentrations and durations that exceeded anything in recent memory during peak fire weather windows.

Particularly affected were communities in Chelan, Okanogan, Ferry, and Stevens counties — areas that also experienced some of the season's most significant fire activity. The Walla Walla Valley, far from the largest fires, was repeatedly blanketed by regional smoke that cancelled outdoor events, closed schools for outdoor activities, and pushed air quality into hazardous categories for extended periods.

Oregon's Smoke Footprint

Oregon's record 2.5 million acres of burned area generated smoke plumes that affected communities far beyond the fire perimeters themselves. The Willamette Valley, home to the state's largest population centers including Portland, Eugene, and Salem, experienced multiple unhealthy air quality days driven by smoke from Eastern Oregon fires drifting west over the Cascades.

Medford and the Rogue Valley — historically one of the regions most sensitive to fire smoke due to its bowl-shaped topography — recorded extended periods of unhealthy-for-sensitive-groups and unhealthy air quality during the peak of the season in July and August.

Health Impacts and Vulnerable Populations

Public health agencies across the region documented increased emergency room visits, respiratory clinic appointments, and prescription fills for asthma and respiratory medications during the highest smoke exposure periods. Vulnerable populations bearing the greatest burden included:

Outdoor workers — farmworkers, construction crews, landscapers — who had limited ability to reduce their exposure
Children and older adults, whose respiratory systems are more sensitive to fine particulate matter
People with pre-existing asthma, COPD, or cardiovascular conditions
People experiencing homelessness with limited access to clean indoor air
Rural and tribal communities with older housing stock that provides less protection from outdoor air

Tools for the Next Season

Air quality agencies across the Pacific Northwest used the 2026 season to test and refine several public notification and health protection tools. AirNow.gov's fire and smoke map, air quality sensors distributed to community organizations, and partnerships with school districts for real-time outdoor activity guidance all helped communities make better decisions during hazardous episodes.

Washington Ecology and Oregon DEQ both highlight the need for expanded community air sensor networks, particularly in rural and tribal communities that are often underrepresented in regulatory monitoring networks. Additional air quality monitoring investments are expected to be a priority heading into 2027 budget discussions.

Looking Forward

Fire managers and air quality regulators are aligned on a core message: reducing future smoke impacts requires reducing the number and severity of large wildfires. That means accelerating prescribed burning, forest treatment, and community fire adaptation — particularly in the high-risk landscapes that generated this year's most damaging smoke events.