Deer Lodge, Montana Air Quality
Deer Lodge air quality today — the AQI, the main pollutant, and whether it’s safe to exercise outside right now
Deer Lodge, MT · Air quality right now
The air quality index in Deer Lodge, MT is 20 (Good) right now — safe for outdoor activity.
Is it safe to be outside in Deer Lodge today?
AQI 20 Yes — air quality is Good
Air is clean — great for outdoor activity.Main pollutant: PM2.5Observed 8:00 AM MDT
Pollutants right now
- PM2.54.8 µg/m³Main pollutantfine particles — smoke, exhaust, soot
- PM105.3 µg/m³coarse particles — dust, pollen, ash
- Ozone13 µg/m³smog — builds on hot, sunny days
- NO₂7.8 µg/m³nitrogen dioxide — traffic, combustion
ExerciseOK to run — no air-quality limits on outdoor exercise.
How to read Deer Lodge’s air quality
Guides: The AQI Scale, Explained · Air Quality Alerts, Decoded · How to Read a Wildfire Smoke Map · Why Wildfire Smoke Travels 1,000 Miles.
Air quality over time in Deer Lodge
Across the EPA’s county records from 2020 to 2025, Deer Lodge’s cleanest year was 2020 (median AQI 3) and its most polluted was 2023 (median AQI 14); the typical (median) day has trended more polluted since 2020.
| Year | Median AQI | Unhealthy+ | Main pollutant | USG | Moderate | Good |
|---|---|---|---|---|---|---|
| 2020 | 3 | 0 | PM2.5 | 0 | 0 | 33 |
| 2021 | 12 | 0 | PM2.5 | 3 | 13 | 101 |
| 2022 | 12 | 0 | PM2.5 | 1 | 8 | 105 |
| 2023 | 14 | 0 | PM2.5 | 2 | 7 | 100 |
| 2024 | 12 | 0 | PM2.5 | 2 | 11 | 101 |
| 2025 | 13 | 0 | PM2.5 | 0 | 5 | 90 |
“USG” is Unhealthy for Sensitive Groups (AQI 101–150); “Unhealthy+” combines the Unhealthy, Very Unhealthy, and Hazardous days. In 2024 the EPA tightened the annual fine-particle (PM2.5) standard to 9 µg/m³ from the previous 12 µg/m³, so counties near the old limit read worse against the new one. Source: EPA AQS annual summaries, 2020–2025.
Frequently asked
- What was the worst year for air quality in Deer Lodge?
- In the EPA's 2020–2025 county records, 2021 had the most days above AQI 100: 3 days (3 Unhealthy for Sensitive Groups, 0 Unhealthy or worse). The highest median AQI came in 2023 (14; 2021's was 12).
- How many unhealthy air days does Deer Lodge have?
- Across 2020–2025, 1% of the days reported for Deer Lodge's county had an AQI above 100 (8 of 582), about 1 day a year. 2025 had 0 days.
- What's the main air pollutant in Deer Lodge?
- PM2.5: it drove Deer Lodge's county AQI on the most days in every year of the EPA's 2020–2025 records.