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Montana’s smoke seasons
Montana DPHHS describes the state's air-quality pattern as summer wildfire smoke followed by winter inversions that trap pollution from wood stoves and vehicles, and advises residents to check individual risk with a health care provider. [1] DNRC's fire protection program covers 50,265,678 acres of state and private land: about 5.2 million acres of direct protection plus roughly 50 million acres through the County Cooperative Program and a network of about 400 fire departments. [2] Northern Rockies Coordination Center year-end data show Montana recorded 2,420 wildfires that burned 1,366,484 acres in 2017, with the U.S. Forest Service accounting for 680,062 of those acres. [3]
The Legislative Fiscal Division called 2017 likely the most expensive state fire year in Montana history, with estimated state liability of $74.2 million and roughly 1.3 million acres burned by the end of September 2017. [4] Headwaters Economics records that the September 2020 Bridger Foothills Fire destroyed 68 structures and that the 2017 Lodgepole Complex near Jordan burned more than 270,000 acres and destroyed 32 structures. [5] Smoke does not respect the fire perimeter: in Montana the houses that never saw a flame spend days inside the plume, and their air is the subject of this page.
Air quality in Montana: reading the numbers
Montana’s air-quality agency is the Montana Department of Environmental Quality — Air Quality Bureau. DEQ's Today's Air site displays hourly PM2.5 concentrations with health-effect categories from the statewide monitoring network, updating at 15 minutes past each hour, and the Montana Data Portal provides 1-hour average PM2.5 data from every station. [6] During wildfire smoke episodes DEQ publishes smoke forecasts that identify smoke sources and project impacts and duration, built from monitor data, fire information, meteorological models, satellite imagery, webcams and low-cost sensors. [7] A July 8, 2021 DEQ advisory rated Frenchtown and Seeley Lake in Missoula County unhealthy for sensitive groups from Idaho and Washington wildfire smoke, advising closed windows, HEPA air cleaners, properly fitted N95 respirators for adults, and more than five days of medication and food on hand. [8]
Nationally, the AQI [9] turns PM2.5 concentrations into six colour bands; from 101 (orange) sensitive groups are affected, from 151 (red) everyone is, and the AirNow wildfire map [10] shows the Montana monitors and the smoke plume together. What the outdoor number does not tell you is the indoor number, and that is where the health question actually lives.
What the smoke does, and to whom, in Montana
Wildfire smoke is mostly fine particulate — PM2.5 — with carbon monoxide, volatile organic compounds and, when structures burn, the metals and plastics of a Montana neighbourhood. The particles are small enough to reach the deep lung and the bloodstream. DPHHS's Smoke From Fires page explains that PM2.5 from wildfire smoke can pass into the bloodstream, that visibility under three miles indicates air unhealthy for sensitive groups, and recommends HEPA air cleaners or DIY box-fan filters and checking AirNow or DEQ's Today's Air. [11] Governor Gianforte proclaimed June 8–12, 2026 Montana Wildfire Smoke Ready Week; DPHHS and DEQ urged MERV-13 or higher furnace filters and portable HEPA cleaners, and DEQ's air quality meteorologist noted smoke can travel hundreds of miles to affect communities statewide. [12]
- Children in Montana breathe more air per pound of body weight and their airways are still developing.
- Older adults and anyone with heart or lung disease, including asthma and COPD, feel Montana’s smoke at lower concentrations.
- Pregnant people and their pregnancies; outdoor workers in Montana; people who cannot afford to close the windows in the heat.
Symptoms run from stinging eyes and a scratchy throat through coughing and wheezing to chest tightness and shortness of breath. A Montana household that notices the last two — or anyone with a heart condition who feels palpitations or unusual fatigue during a smoke episode — should call a clinician; our after-exposure guide covers the first days.
Keeping it out of a Montana house
The EPA’s guidance on wildfires and indoor air quality [13] is the standard playbook: close windows and doors, set the HVAC to recirculate and fit the highest-MERV filter the system tolerates, run a HEPA air cleaner in one room and make that the clean room, do not add to indoor particles (no candles, no frying, no vacuuming without a HEPA vacuum), and open up to ventilate when the outdoor AQI drops. In Montana’s heat that trade-off is real, which is why a clean room with a portable air cleaner is the practical unit of protection rather than the whole house.
When the outdoor air clears, the Montana house may not have. Residue that settled on surfaces and in the ductwork keeps releasing what it absorbed, and the smell that returns on warm days is that residue. That is the point at which a health question becomes a measurement question — and then a claim question.
After the smoke: test, then claim
If your Montana home smells of smoke, two kinds of professional are relevant and it helps to know which you are calling. Certified Industrial Hygienists (CIHs) and environmental consultants test: they measure what settled on the surfaces and what is still in the air, and they put a number on it. Fire damage restoration technicians — disaster restoration specialists — clean: soot comes off with chemical sponges and HEPA vacuums, odor is treated with air scrubbers and thermal fogging, and any firefighting water is dried out before it becomes a mold problem.
Testing before cleaning is the rule for Montana homes that sat in a plume: United Policyholders [14] explains that smoke and ash damage to a standing home is covered and that independent CIH testing is what makes the claim specific to your house; the hygienist’s report is also what tells you whether the children’s bedroom is safe to sleep in tonight. The health-first sequence on this site walks through the first week; the Montana claim guide on our sister site handles the paperwork.
Embers and heat, not smoke, damage roofs — but a Montana house inside a wildfire perimeter may have had both, and the attic is where residue persists longest. Smoke odor in decking and attic insulation [15] explains why the attic is a separate inspection; the picker below finds a Montana roofer for it.