Billings Air Quality in 2023
In 2023, Billings's air quality (Billings, MT area) had a median daily AQI of 29 (Good) across 357 monitored days. 4 days (1.1%) reached Unhealthy for Sensitive Groups or worse, 306 were Good, and the year's peak AQI was 191 (Unhealthy). Fine particulate matter (PM2.5) set the daily AQI on 357 of those days. The cleanest month of 2023 was June (median AQI 17, 0 days above 100) and the worst was September (median 41, 2 days above 100, peak 191).
- Good: 85.7%
- Moderate: 13.2%
- Unhealthy for Sensitive Groups: 0.8%
- Unhealthy or worse: 0.3%
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How was Billings's air quality in 2023?
Good on a typical day: median AQI 29, with 4 days above AQI 100 out of 357 monitored — the 5th cleanest of 6 years on record for the area.
- ✓Peak AQI in 2023: 191 (Unhealthy).
- ✓Fine particulate matter (PM2.5) was the main pollutant on 357 days.
- ✓Cleanest month: June; worst: September.
Frequently asked questions
What was the average AQI in Billings in 2023?▾
EPA's Air Quality System puts Billings's (Billings, MT) median daily AQI for 2023 at 29, which is Good. 4 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 191.
Which month had the worst air quality in Billings in 2023?▾
The cleanest month of 2023 was June (median AQI 17, 0 days above 100) and the worst was September (median 41, 2 days above 100, peak 191).
Was 2023 a good or bad year for Billings's air?▾
Among the 6 years EPA has published for the area (2020–2025), 2023 ranks 5th cleanest by days above AQI 100. 2023's median of 29 is below the area's typical annual median of 38.
Billings month by month in 2023
Billings air quality month by month, 2023 (Billings, MT, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 28 | 0 | 55 | PM2.5 |
| February | 28 | 21 | 0 | 53 | PM2.5 |
| March | 28 | 46 | 0 | 65 | PM2.5 |
| April | 29 | 24 | 0 | 68 | PM2.5 |
| May | 31 | 24 | 0 | 95 | PM2.5 |
| Junecleanest | 30 | 17 | 0 | 57 | PM2.5 |
| July | 31 | 32 | 2 | 115 | PM2.5 |
| August | 31 | 27 | 0 | 70 | PM2.5 |
| Septemberworst | 30 | 41 | 2 | 191 | PM2.5 |
| October | 29 | 29 | 0 | 52 | PM2.5 |
| November | 28 | 35 | 0 | 56 | PM2.5 |
| December | 31 | 28 | 0 | 51 | PM2.5 |
How 2023 compares
Among the 6 years EPA has published for the area (2020–2025), 2023 ranks 5th cleanest by days above AQI 100.
2023's median of 29 is below the area's typical annual median of 38.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Billings
The latest EPA AirNow observation puts Billings's AQI at 25 (PM2.5). The figures above are multi-year annual statistics, not today's reading.
View current Billings air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Billings, MT), 2019–2025. Daily AQI per CBSA is the highest AQI reported by any monitor in the area that day; the defining parameter is the pollutant that set it. Month and season statistics pool every such day in the period across all years listed. Retrieved 2026-09-09.