Sanders, Montana Air Quality Today
AirHistory tracks long-run EPA monitoring rather than live readings, so for the live number check AirNow.gov below. As a baseline, Sanders, Montana's most recent EPA year (2023) posted a median AQI of 37 (Good) against a 5-year median of 36 and an overall Grade of D. The dominant pollutant is Fine Particulate Matter (PM2.5), which tells you which days are most likely to spike.
Check Today's Live AQI in Sanders, Montana
AirHistory is built on 10 years of EPA Air Quality System records, so it shows you what air quality in Sanders, Montana typically looks like — not the live reading for this exact hour. For today's real-time AQI, check AirNow.gov (the EPA's official live index) or the AirNow Fire and Smoke Map during wildfire season.
That said, the history is the best predictor of a normal day. In 2023, Sanders, Montana posted a median AQI of 37 (Good), with 263 "Good" days and 5 days that crossed into "Unhealthy for Sensitive Groups" or worse. The dominant pollutant, Fine Particulate Matter (PM2.5), is the one most likely to push today's number up — Fine particulate matter — particles less than 2.5 micrometers across — comes mostly from combustion: vehicle exhaust, wildfire smoke, residential wood burning, and industrial emissions. Because these particles are small enough to enter the bloodstream, PM2.5 is the pollutant most strongly linked to cardiovascular disease, respiratory illness, and premature death.
Sanders, Montana Air Quality Snapshot
| Air Quality Grade | D48/100 |
| 5-Year Median AQI | 36 (Good) |
| Most Recent Median AQI (2023) | 37 (Good) |
| Dominant Pollutant | Fine Particulate Matter (PM2.5) |
| 10-Year Trend | Worsening (+2.96 AQI/yr) |
| Unhealthy Days (last 5 yr) | 38 |
| National Rank (cleanest = #1) | #272 of 1,020 (27th cleanest percentile) |
| Montana Rank | #11 of 19 |
What Does the D Grade Mean?
Sanders, Montana earns a D — air quality falls below the U.S. average, with a 5-year median AQI of 36. Residents with asthma, COPD, heart disease, or young children should watch daily AQI forecasts and limit outdoor exertion when alerts go out.
Sanders, Montana's 5-year median AQI of 36 is 5 points below the national average of 41 — meaningfully cleaner than the typical U.S. metro tracked here. Within Montana, Sanders, Montana runs more polluted than the state average of 31 — local sources or geography are concentrating pollution above the state's typical reading.
For context within Montana: Rosebud, Montana currently holds the state's cleanest grade (A, AQI 23), while Lincoln, Montana sits at the bottom (C, AQI 52).
What's in Sanders, Montana's Air?
The dominant pollutant in Sanders, Montana is Fine Particulate Matter (PM2.5). Fine particulate matter — particles less than 2.5 micrometers across — comes mostly from combustion: vehicle exhaust, wildfire smoke, residential wood burning, and industrial emissions. Because these particles are small enough to enter the bloodstream, PM2.5 is the pollutant most strongly linked to cardiovascular disease, respiratory illness, and premature death.
Days by Dominant Pollutant (2023)
| Pollutant | Days as Dominant | Share of Year |
|---|---|---|
| Fine Particulate Matter (PM2.5) | 361 | 99% |
| Coarse Particulate Matter (PM10) | 3 | 1% |
Is the Air Getting Better or Worse?
Air quality in Sanders, Montana has been getting worse over the past decade, with median AQI climbing by roughly 3.0 points per year. That bucks the national trend of broad improvement, and most often reflects either growing wildfire smoke exposure (particularly across the West) or rising local emissions from population and freight growth.
In 2014, Sanders, Montana posted a median AQI of 13. By 2023 that figure was 37 — a rise of 24 AQI points dirtier across 10 years of EPA records.
Year-by-Year AQI in Sanders, Montana
| Year | Median AQI | Good Days | Unhealthy Days | Dominant Pollutant |
|---|---|---|---|---|
| 2014 | 13 | 326 | 0 | PM10 |
| 2015 | 17 | 336 | 3 | PM10 |
| 2016 | 12 | 324 | 0 | PM10 |
| 2017 | 33 | 242 | 13 | PM2.5 |
| 2018 | 37 | 256 | 14 | PM2.5 |
| 2019 | 33 | 289 | 0 | PM2.5 |
| 2020 | 31 | 302 | 8 | PM2.5 |
| 2021 | 42 | 232 | 20 | PM2.5 |
| 2022 | 36 | 266 | 5 | PM2.5 |
| 2023 | 37 | 263 | 5 | PM2.5 |
Health Context for Sanders, Montana
Across the past five years, this area has logged 38 days where AQI rose into the "Unhealthy for Sensitive Groups" range or worse — about 8 days per year. That is roughly typical for a U.S. metro, with most caution days clustered in summer (ozone) or wildfire season.
Treat daily AQI forecasts as essential input. On flagged days, sensitive groups (asthma, COPD, heart disease, pregnancy, young children, older adults) should limit outdoor exertion and keep windows closed. A HEPA air cleaner sized to a bedroom or family room can cut indoor PM2.5 by 80%+ during smoke or pollution events. Because PM2.5 penetrates deep into the lungs and bloodstream, an N95 or KN95 mask provides meaningful protection on smoky or high-particulate days — surgical masks do not.
How This Grade Is Calculated
The AirHistory Air Quality Grade combines four signals: the 5-year median AQI (40% of the score), the 10-year trend direction (30%), the count of unhealthy days per year (20%), and the dominant pollutant type (10%). All four come directly from the EPA Air Quality System (AQS), which aggregates readings from federally certified monitors. Read the full methodology.
More about Sanders, Montana
Sanders, Montana has an Air Quality Grade of D (poor) with a 5-year median AQI of 36. The dominant pollutant is Fine Particulate Matter (PM2.5), and air quality has been worsening over the past decade.
The data source behind this answer is the EPA Air Quality System (AQS). Every figure on the page traces back to that source; the methodology page describes the inputs and the refresh cadence in full detail.
A practical caveat: the headline answer above reflects the most recent the EPA Air Quality System (AQS) vintage; underlying data is often revised for months after first publication, and the right reference for any specific decision is whichever vintage is current at the time of the decision. The as-of date is stamped on every page.
Source: EPA Outdoor Air Quality Data, 2026.