Washington's wildfire smoke alert has widened again, and it now overlaps with a heat advisory covering much of western Washington.
The air quality alert covers seven counties: Grays Harbor, King, Kitsap, Mason, Pierce, Snohomish and Thurston. It runs until 5 p.m. Thursday. The heat advisory runs until 10 p.m. Thursday, with the National Weather Service forecasting highs of 85 to 90 degrees across the affected zones and overnight lows of 58 to 62.
That overlap is the practical change for households. Smoke guidance says shut the house up. Heat guidance says get cool. In a region where many homes were built without air conditioning, those instructions collide.
The Alert Footprint and the Timeline Officials Have Given
The alert grew in stages. The Puget Sound Clean Air Agency and the Olympic Region Clean Air Agency initially covered King, Kitsap, Pierce, Snohomish and Thurston counties through Wednesday afternoon. Late Tuesday morning, Mason and Grays Harbor were added and the expiration was pushed to Thursday.
The heaviest impacts are expected across the South Kitsap Peninsula, the South Sound, the Chehalis Valley, Seattle's Eastside, foothill and valley communities, and parts of Hood Canal. Early morning readings ran unhealthy from Bellingham through Sedro-Woolley, Darrington, Granite Falls, Renton, Sammamish, Auburn, Tacoma and Olympia.
The seven-county figure describes western Washington only. A separate air quality alert covers counties east of the Cascades, issued by the National Weather Service in coordination with state and local air quality agencies, and the Spokane Regional Clean Air Agency said its alert continues with air quality expected to sit in the unhealthy for sensitive groups range Wednesday and Thursday. Seven counties are not the statewide total.
Beth Friedman, lead air quality forecaster and modeler for the Washington State Department of Ecology, told KOMO News that conditions could begin improving later in the week. She said "onshore flow does look to increase on Friday," which she described as the best chance for gradual air quality improvement in western Washington.
What the Alert Actually Says
The alert language is worth reading rather than paraphrasing loosely, because it sets a specific expectation.
Air quality is forecast to range from unhealthy for sensitive groups to unhealthy across most of the alert area. At the first level, people with health concerns and pre-existing conditions should reduce exposure and take precautions. At the unhealthy level, the guidance widens to everyone: limit time outside, avoid strenuous outdoor activity, and follow steps for cleaner indoor air.
That distinction is the part readers most often misread. Unhealthy for sensitive groups does not mean the air is fine for everyone else. It means people in defined risk categories are likely to experience effects while the general population usually will not.
The mechanism is fine particulate matter. Ecology describes wildfire smoke as the largest source of particle pollution in Washington and says breathing it causes wheezing and coughing, heart and lung disease, and death. Particles at this size reach deep into the lungs, and the smallest cross into the bloodstream, where they drive inflammation that can destabilize existing cardiovascular disease.
Separately, an emergency burn ban issued under the governor's proclamation prohibits most outdoor and agricultural burning statewide through September 30.
Two Hazards That Push Households in Opposite Directions
The National Weather Service advisory addresses the collision directly. Its guidance is to go to spaces with both indoor cooling and air filtration. Where there is no air conditioning, it advises pulling shades to block daytime heat and using portable air cleaners or do-it-yourself box fan filters to help cool and clean the air, while staying hydrated and limiting activity until conditions improve.
For a household with air conditioning, that translates to closing up, setting the system to recirculate and running a HEPA air cleaner. For a household without it, sealing the house through a 90 degree afternoon is not the safer option, which is why the advisory pairs shading and filtration rather than telling people to simply stay sealed in.
Anyone who must go outside is strongly encouraged to wear a well-fitted N95 respirator. Cloth, dust, and surgical masks do not filter fine smoke particles. NIOSH does not approve respirators for children, and people with heart or lung conditions should ask a clinician before relying on one.
For sheltering information and other human services, the advisory directs residents to dial 211 during business hours or visit wa211.org. MedicalDaily previously reported on the initial Puget Sound smoke alert covering four counties, and its guidance to set up an indoor clean air space now applies to three more.
Outdoor Workers and Sensitive Groups Carry the Heaviest Load
Risk is not evenly distributed.
The people who should act first are those with asthma or COPD, people with heart disease, pregnant people, infants and young children, adults over 65, and anyone working or exercising outdoors. Asthma and COPD patients should keep rescue inhalers accessible and confirm with a clinician when to step up controller medication and when to seek care. Do not change any prescribed medication without speaking to a clinician.
Outdoor workers are the group with the least ability to follow the advisory. Under Washington's heat rules, employers must take heat-protective actions once temperatures reach 80 degrees for most outdoor work; workers must be allowed preventative cool-down periods as needed; and at 90 degrees, employers must provide mandatory paid 10-minute cool-down breaks every two hours. For smoke, state rules require employers to monitor air quality and maintain a written response plan covering training and protective equipment such as N95 respirators once air quality crosses defined thresholds. The requirement applies to all workplaces, including agricultural operations. Workers unsure of their protections can contact the state Department of Labor and Industries.
Symptoms that warrant urgent evaluation include chest pain, severe shortness of breath, wheezing that does not respond to a rescue inhaler, palpitations or confusion, along with heat warning signs such as hot dry skin, fainting or a rapidly rising body temperature. Call 911 for serious symptoms. This article is general information and is not a diagnosis.
Conditions shift quickly with wind, and the current alert is set to expire Thursday afternoon. Whether it is extended depends on fire activity and the timing of onshore flow. Current readings are posted on Ecology's air quality map, and MedicalDaily will keep tracking the alert footprint.
Frequently Asked Questions
Which counties are covered? Grays Harbor, King, Kitsap, Mason, Pierce, Snohomish and Thurston, through 5 p.m. Thursday.
Is the whole state covered? No. A separate alert covers counties east of the Cascades, where the Spokane Regional Clean Air Agency says its alert continues.
What does the heat advisory cover? Zones across northwest and west central Washington until 10 p.m. Thursday, with highs of 85 to 90 degrees forecast.
How bad is the air expected to get? The alert forecasts unhealthy for sensitive groups to unhealthy conditions for most of the area.
Should I close my windows or open them? Close them if you can keep the house at a safe temperature. If you cannot, pull shades to block heat and run an air cleaner or box fan filter to cool and clean the air.
Do masks help? Only a properly fitted N95 or similar respirator. Cloth, dust and surgical masks do not filter fine smoke particles.
When is relief expected? Ecology's lead forecaster said onshore flow is expected to increase Friday, offering the best chance of improvement for western Washington.
What if I work outdoors? Washington requires heat protections starting at 80 degrees and mandatory cool-down breaks at 90 degrees, plus a written wildfire smoke response plan. Questions can go to the state Department of Labor and Industries.
