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Washington’s smoke can shift quickly with Cascades gap winds, the Puget Sound Convergence Zone, and offshore flow. In this blog, you will learn how to use the AirNow Fire and Smoke Map, how to read AQI for your area, and what to do at home and on the go when smoke levels rise.
Start with the AirNow Fire and Smoke Map, then recheck in the afternoon when winds and the convergence zone can change AQI quickly.
Keep windows closed, set HVAC to recirculate, and use the highest MERV your system can handle while keeping normal airflow.
In prolonged smoke, inspect filters every one to two weeks. One-inch filters load fast.
Create one clean air room with a right-sized HEPA purifier and keep the door closed.
If you must be outside in heavy smoke, reduce exertion and wear a well-fitting N95 or P100.
Open the AirNow Fire and Smoke Map and search your city or ZIP code. Tap a monitor for current AQI and health guidance. Use the time slider to watch how plumes move across the Cascades and through population centers.
West of the Cascades. Marine air can improve AQI quickly, while offshore flow or convergence zone bands can trap smoke along the lowlands from Olympia to Everett.East of the Cascades. Afternoon upslope and downslope winds can pool smoke in valleys and basins, then mix out late morning. Regional fires in central WA, OR, ID, or BC often drive conditions.
On Puget Sound, narrow bands of clouds and wind shifts can swing AQI within a few miles. Recheck AirNow in the afternoon and early evening, especially from Seattle to Everett, as marine pushes can clear or worsen conditions rapidly.
Keep car windows closed and set the vehicle to recirculate. Ferry waiting areas are often breezy but can still carry smoke downwind. Plan crossings and transit trips for the clearest hours the map shows, and keep trips short when AQI is high.
Indoor plan on smoky days
Seal and recirculate. Close windows and outside air intakes. Run the fan so air passes the filter more often.
Use efficient filtration. Many homes use MERV 11 day to day and move to MERV 13, as recommended by EPA, during smoke if airflow and comfort stay normal.
Clean air room. Choose a bedroom or living area, keep the door closed, and run a HEPA purifier sized for the room.
Short term backup. A box fan with a MERV 13 filter can help if built and used safely with a newer certified fan. Do not leave it unattended.
Older Westside homes often lack central cooling. Use a right sized HEPA purifier in the main sleeping area, keep interior doors closed, and limit window fans during smoke. If you must cool, ventilate briefly only after the map shows cleaner air.
Post the day’s AQI where people can see it. At AQI 101 or higher, move strenuous activities indoors, keep doors closed, and run HVAC continuously on recirculate with the highest MERV the system supports. Add HEPA units in gyms, studios, and childcare rooms.
When heat waves and smoke overlap, prioritize a clean and cool room. Use a HEPA purifier and safe cooling methods. If the home cannot stay cool, visit a community cooling site during the clearest window the map shows and return when AQI improves.
Check monthly by default. During active smoke, inspect every one to two weeks and replace early if the media looks gray or matted or if airflow drops at vents. If the cabinet allows, a two inch or four-inch pleated filter provides more media and often lasts longer than a one-inch filter.
Once AQI improves, replace smoke loaded filters, vacuum with a HEPA vacuum, and wipe hard surfaces with a damp cloth. Clean supply and return grilles and confirm the HVAC drain pan is clear.
Check today’s AQI on the AirNow Fire and Smoke Map, then make sure your home is ready.
Order MERV 13 or MERV 11 filters from Filterbuy in standard or custom sizes. Filters are made in the USA and ship fast with free delivery. Turn on Auto Delivery so replacements arrive on schedule through Washington’s smoke season.
Open the AirNow Fire and Smoke Map. Enter your city or ZIP code to view AQI, PM2.5, and smoke plumes.
The Puget Sound Convergence Zone and marine pushes can shift winds within a few miles. Recheck the map in the afternoon and early evening.
Strong winds through mountain passes can move smoke quickly from east to west or the reverse. Expect rapid changes near gaps like Snoqualmie and Stevens.
Use AQI 101 and higher as your cue to limit outdoor activity. Sensitive groups should be cautious even at Moderate.
Yes. Use the highest MERV your system can handle while keeping normal airflow. Many homes use MERV 11 most days and move to MERV 13 during smoke if the system supports it.
Set up a HEPA purifier in the bedroom or main living area. Keep windows closed during smoky hours and air out briefly only when the map shows cleaner air.
Check monthly by default. During prolonged smoke, inspect every one to two weeks and replace early if the media looks gray or matted or if airflow drops.
If your cabinet allows it, a two inch or four inch pleated filter has more media and usually lasts longer than a one inch filter.
They can help as a short term option if built safely with a newer certified box fan and a MERV 13 filter. Do not leave them unattended.
Prioritize a clean and cool room. Run a HEPA purifier and use safe cooling. If the home cannot stay cool, visit an air conditioned space during the clearest window shown on the map.
A well fitting N95 or P100 can reduce particle exposure. Cloth and surgical masks are not designed for fine smoke.
Keep common area windows closed, run central fans on recirculate, and add HEPA purifiers in gyms and lounges. Post the day’s AQI where residents can see it.
In the car, close the windows and the setting should be “recirculate.” On ferry travel days, plan crossings for the clearest hours the map shows and keep trips short when AQI is high.
Wait until the AirNow map shows cleaner air for several hours. Ventilate briefly, then close up and return to recirculate if levels rise.
Children, older adults, people who are pregnant, and anyone with asthma, COPD, or heart disease. They should reduce exposure early and follow care plans.
