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Idaho’s smoke picture is shaped by basin-and-range terrain, valley inversions on the Snake River Plain, and fast wind shifts through gaps and canyons. Use the live tools below to see current conditions and set a practical plan at home.
For live conditions, start with the AirNow Fire and Smoke Map, then check Idaho DEQ real-time AQI and forecasts.
Limit outdoor activity at AQI 101+. If you must be outside in heavy smoke, use a well-fitting N95 or P100.
Indoors, run the system on “recirculate” and use the highest MERV your system can handle. Many homes use MERV 11 daily and move to MERV 13 during smoke if airflow stays normal. Add a HEPA room purifier.
Inspect and replace filters more often during prolonged smoke. One-inch filters load quickly.
Wildfire smoke risk typically increases from late spring through early fall. Prescribed burns can create short smoke periods in spring and fall. In winter, residential wood heating can raise PM2.5 in some valleys, so continue to check AQI even outside fire season.
Valley inversions: Overnight and morning inversions can hold smoke near the surface across the Snake River Plain and intermountain valleys, with improvement as daytime mixing increases.
Gap and downslope winds: Canyon and pass winds can transport smoke quickly toward Boise and other valley cities.
Regional transport: Smoke from Oregon, Washington, or Montana can affect Idaho even when in-state incidents are small. Check regional layers, not just local fires.
Wildfire smoke raises PM2.5, fine particles that penetrate deep into the lungs and can affect the heart and respiratory system. Higher-risk groups include children, older adults, people who are pregnant, and anyone with asthma, COPD, or heart disease. Short-term effects can include coughing, wheezing, irritated eyes, chest tightness, headaches, and fatigue. Reduce exposure when AQI rises.
Check the data. Look at AirNow for plumes and monitors, then review Idaho DEQ for local AQI and forecasts. Recheck later in the day as winds shift.
Set HVAC to recirculate. Keep windows closed so air passes through your filter rather than pulling new smoke indoors.
Use efficient filtration. If your central system maintains normal airflow, install MERV 13 during smoke events. If resistance is too high, use MERV 11 and add a HEPA room purifier sized for the space.
DIY stopgap if needed. A box fan with a MERV 13 filter, as recommended by the EPA, can reduce indoor smoke when built and used safely. Use newer certified fans and follow assembly and safety notes.
If you must go outside. Wear a NIOSH-approved N95 or P100 that fits well.
Check monthly by default and every one to two weeks during prolonged smoke. Replace early if the media looks gray or matted or if airflow drops. One-inch filters load quickly; two- or four-inch pleated filters last longer if your cabinet allows. Return to your normal schedule once AQI improves for several days.
Open the AirNow Fire and Smoke Map, confirm today’s AQI for your location, and set your system to recirculate.
If you need high-efficiency filters, order MERV 13 or MERV 11 from Filterbuy in standard or custom sizes. Filters are made in the USA and ship fast with free delivery, and Auto Delivery keeps replacements on schedule through Idaho’s smoke season.
Open the AirNow Fire and Smoke Map and zoom to your town. Then check Idaho DEQ’s real-time AQI map and daily forecast.
Begin limiting at AQI 101 and higher. Sensitive groups should be cautious even at Moderate levels.
Overnight and morning temperature inversions in the Snake River Plain and intermountain valleys can trap smoke near the ground until mixing improves later in the day.
Yes. Use the highest MERV your system can handle while keeping normal airflow. Many homes use MERV 11 daily and switch to MERV 13 during smoke if the system supports it.
Yes. Use a HEPA purifier sized for the room and keep doors and windows closed to create a clean air space.
They can help as a short term option when built and used safely. Use a newer certified box fan with a MERV 13 filter and do not leave it unattended.
Check monthly by default. During active smoke inspect every one to two weeks and replace early if the filter looks gray or matted or if airflow drops.
Close windows and outside air intakes. Set the system to recirculate and run the fan so air passes through the filter more often.
Avoid pulling outdoor air during smoke. Reduce use or cover outdoor intakes where safe. Window units should run on recirculate and be paired with a HEPA purifier in the room.
A well fitting N95 or P100 respirator reduces particle exposure. Cloth and surgical masks are not designed for fine smoke particles.
Base your decision on AQI rather than smell. Fine particles can be elevated even when odor is mild.
Children, older adults, people who are pregnant, and anyone with asthma, COPD, or heart disease. They should reduce exposure early and follow care plans.
Yes. Keep pets indoors when AQI is high, limit outdoor activity, and create a clean air room where they spend time.
Treat it the same as wildfire smoke. Follow AQI guidance, use indoor filtration, and limit outdoor activity until conditions improve.
Set the car to recirculate and keep windows closed. A high efficiency cabin filter can reduce particle entry. Avoid long drives in very high AQI when possible.
