Air quality dropped to “Unhealthy” levels across rural Oregon Monday morning, with readings between 151 and 200 on the Air Quality Index.
Tiny particles smaller than 2.5 micrometers built up near the ground, small enough to get into the lungs and blood. Oregon’s environmental agency tracked worsening conditions in southern Deschutes and northern Klamath counties.
Thousands of residents faced dangerous air filled with invisible pollutants that can cause heart problems and breathing difficulties.
Mounting Pressure
Central Oregon now experiences 28 times more unhealthy air days than it did before 2013. Bend recorded 99 days with poor air quality between 2013 and 2024.
November warnings have become common as the weather traps pollution, much like a lid on a pot. Wood burning for heat adds 31% to 93% of harmful particles in different communities.
Klamath Falls went from 1.4 poor air days yearly before 2016 to 13.2 days after 2017. Climate change has made these problems worse year-round.
Winter’s Hidden Hazard
Wood burning became Oregon’s largest source of winter pollution decades ago. State rules from 1986 now require cleaner wood stoves.
Oregon’s wood stoves and fireplaces release 12.8 million pounds of pollution yearly—more than half of California’s 2017 Sonoma County wildfire emissions. Cold nights trap wood smoke near the ground for hours or days.
Some areas get 86% of their particle pollution from wood smoke. State law now prohibits home sales with old, dirty wood stoves, although thousands of people still use wood for heating.
Stagnant Skies
High-pressure weather systems in November create conditions with trapped air. Warm air above stops cooler surface air from rising and clearing out pollution.
Studies from 2000 to 2023 reveal clear patterns of trapped cold air in valleys beneath warmer air layers. These weather patterns can last for days, letting pollution build up hour by hour.
Oregon’s valleys and basins get hit especially hard. Scientists say these trapping events occur more frequently now and last longer, resulting in more hazardous air days despite cleanup efforts.
The Advisory
Oregon’s environmental agency issued an air quality warning on Monday, November 10, 2025, for Deschutes and Northern Klamath counties. Pollution reached “Unhealthy” levels, posing health risks to everyone outdoors.
The warning stated: “People with heart or lung problems and young children should stay indoors while smoke levels are high.” The alert covered about 5,840 residents in La Pine, northern Klamath County, and Sunriver.
Forecasters expected bad air until Wednesday afternoon, November 12. This was one of Central Oregon’s biggest November air quality warnings.
Communities Under Siege
La Pine, with fewer than 3,000 people along Highway 97, became the crisis center. Monitors showed “Unhealthy” and “Poor” air throughout Monday and Tuesday.
City officials posted urgent warnings as pollution rose from “Poor” to “Unhealthy”—bad for everyone, not just vulnerable people. Sunriver, known for clean mountain air, was also trapped in polluted air.
Northern Klamath County towns faced similar dangers in valleys where cold air pooled. The timing coincided with colder nights, when people burned more wood for heat, exacerbating the problem.
Vulnerable Populations
Children are three times more susceptible to harm from particles because their lungs are still developing and they breathe more rapidly. Older adults have weaker lungs and immune systems, making them vulnerable to breathing problems.
Pregnant women risk anxiety, depression, and problems for their babies. People with asthma, lung disease, or heart conditions get much sicker during pollution events, with more emergency room visits.
Oregon’s warning highlighted these groups, noting that while everyone faces health effects at these pollution levels, vulnerable people suffer much more serious problems.
The Source Confusion
Oregon’s environmental agency issued the warning, but relies on AirNow—a partnership between EPA, NOAA, and states—for air monitoring data. EPA runs the AirNow tracking system, but Oregon issues its own air warnings under state law.
The difference matters: The EPA sets national standards and funds monitoring, while Oregon runs specific programs, such as requiring the removal of old wood stoves when homes are sold.
Oregon operates over 40 air monitoring sites, including newer low-cost monitors at $2,000 each. The partnership sometimes confuses people about which agency issues warnings.
National Air Quality Crisis
Oregon’s warning occurred during a nationwide air quality issue. Nearly 25 million more Americans breathed unhealthy air in 2025 than the year before—the worst in ten years. Heat, drought, and wildfires worsened pollution across the country.
Los Angeles experienced the worst ozone pollution for the 25th consecutive year in 26 years. Bakersfield had the worst particle pollution for six years straight.
Research shows that wildfire smoke causes up to 10 times more breathing harm than pollution from cars or factories, suggesting that current air standards may not adequately protect people.
The Terminology Gap
Oregon issued an “air quality advisory”—not a “shelter alert”—using that exact term on all platforms. The difference matters: air quality advisories give health guidance and recommend actions, while shelter alerts mean immediate emergencies requiring urgent indoor protection.
Oregon’s system ranks air from Green (Good) to Maroon (Hazardous), with November 10 in the Red zone.
The agency told vulnerable people to stay indoors and everyone to avoid hard outdoor activities, but didn’t declare shelter-in-place orders. Emergency experts say precise words help people understand threat levels and proper responses.
Residents’ Dilemma
Rural Oregonians face a tough choice: burn wood to stay warm and create pollution, or use expensive electric or propane heat. Wood heat costs less despite pollution problems.
Oregon now bans most wood burning during air quality warnings, with exceptions for individuals who use only wood heat, low-income families (earning 60% or less of the median income), and emergencies such as power outages.
Data shows that Central Oregon communities continue to burn wood because other options are more expensive. Residents feel frustrated being told to stay inside while also limiting their heat, creating tension between health and comfort.
Regulatory Evolution
Oregon’s wood stove rules have undergone significant changes since 1986, when cleaner stoves became mandatory. Current law requires the removal of old, dirty wood stoves when homes are sold. The state provides grants to help people replace their dirty stoves with cleaner heating options.
Multiple communities restrict wood burning on days with poor air quality: Multnomah County issues red alerts banning most burning, accompanied by fines, while Lane County uses a color-coded system (Green/Yellow/Red) for guidance on burning.
Rules include exceptions for low-income households and rural areas without access to natural gas. Officials acknowledge voluntary programs have limited success during critical air events.
Climate Change Connection
South-central Oregon’s average temperature has risen 32.09°F per decade since 1895. Climate models predict that warming will accelerate to 34.3–39.2°F by 2050 and 36.9–40.6°F by 2080.
Warming causes multiple air problems: less snow means a 40-60% decrease in summer water flow by 2040, which increases wildfire risk.
Higher temperatures create stronger trapped air conditions in winter. Wildfire seasons now start earlier and last longer, with the October 2022 fires marking an unusual late start.
November air warnings were once rare, but now happen regularly. Year-round air quality problems are now unprecedented in Oregon’s history.
Health System Impacts
Research shows tiny particles get into the blood, damaging vessels and causing body-wide inflammation like tobacco smoke. Long-term exposure increases risks of heart disease, lung cancer, breathing diseases, infections, stroke, diabetes, and birth problems.
A small increase in particles (10 μg/m³) is associated with 11% more heart problems and 31% more respiratory deaths. Short-term exposure can trigger heart attacks within hours or days.
Central Oregon hospitals prepare for an increase in emergency visits during multi-day air quality warnings, anticipating spikes in asthma attacks, breathing distress, and heart-related events. Everyone faces health risks above 150 AQI.
Unresolved Future
The November 2025 warning ended on Wednesday afternoon, but similar weather patterns are expected to return this winter. Oregon reports that all areas now meet national air quality standards, compared to only 30% in 1980; however, climate change threatens to reverse that progress.
Will better monitoring and cleaner wood stoves be enough, or will Oregon need stricter wood-burning bans that conflict with rural residents’ budgets and traditions?
The basic problem remains: thousands need affordable wood heat, but burning it creates pollution, forcing vulnerable neighbors indoors. Oregon’s air challenges raise hard questions about balancing individual needs, community health, and environmental protection.