Boise Air Quality in 2023
In 2023, Boise's air quality (Boise City, ID area) had a median daily AQI of 51 (Moderate) across 365 monitored days. 3 days (0.8%) reached Unhealthy for Sensitive Groups or worse, 180 were Good, and the year's peak AQI was 120 (Unhealthy for Sensitive Groups). Fine particulate matter (PM2.5) set the daily AQI on 197 of those days. The cleanest month of 2023 was March (median AQI 40, 0 days above 100) and the worst was July (median 56, 1 day above 100, peak 102).
- Good: 49.3%
- Moderate: 49.9%
- Unhealthy for Sensitive Groups: 0.8%
- Unhealthy or worse: 0.0%
Extra Protection for Boise Homes
Air quality in Boise is moderate (AQI 59), with fine particles (PM2.5) the main concern. A True-HEPA purifier gives sensitive groups — kids, seniors and anyone with asthma or allergies — cleaner air indoors on days like today.
Recommended: Coway AP-1512HH Mighty — True HEPA + carbon · CADR ~246 CFM · rooms up to 361 sq ft
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How was Boise's air quality in 2023?
Moderate on a typical day: median AQI 51, with 3 days above AQI 100 out of 365 monitored — the 3rd cleanest of 7 years on record for the area.
- ✓Peak AQI in 2023: 120 (Unhealthy for Sensitive Groups).
- ✓Fine particulate matter (PM2.5) was the main pollutant on 197 days.
- ✓Cleanest month: March; worst: July.
Frequently asked questions
What was the average AQI in Boise in 2023?▾
EPA's Air Quality System puts Boise's (Boise City, ID) median daily AQI for 2023 at 51, which is Moderate. 3 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 120.
Which month had the worst air quality in Boise in 2023?▾
The cleanest month of 2023 was March (median AQI 40, 0 days above 100) and the worst was July (median 56, 1 day above 100, peak 102).
Was 2023 a good or bad year for Boise's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2023 ranks 3rd cleanest by days above AQI 100. 2023's median of 51 is below the area's typical annual median of 54.
Boise month by month in 2023
Boise air quality month by month, 2023 (Boise City, ID, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 56 | 0 | 70 | PM2.5 |
| February | 28 | 53 | 0 | 72 | PM2.5 |
| Marchcleanest | 31 | 40 | 0 | 58 | O3 |
| April | 30 | 45 | 0 | 90 | O3 |
| May | 31 | 49 | 1 | 101 | O3 |
| June | 30 | 49 | 0 | 74 | O3 |
| Julyworst | 31 | 56 | 1 | 102 | O3 |
| August | 31 | 54 | 0 | 98 | O3 |
| September | 30 | 47 | 0 | 72 | O3 |
| October | 31 | 39 | 1 | 120 | PM2.5 |
| November | 30 | 56 | 0 | 88 | PM2.5 |
| December | 31 | 59 | 0 | 74 | PM2.5 |
How 2023 compares
Among the 7 years EPA has published for the area (2019–2025), 2023 ranks 3rd cleanest by days above AQI 100.
2023's median of 51 is below the area's typical annual median of 54.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Boise
The latest EPA AirNow observation puts Boise's AQI at 59 (PM2.5). The figures above are multi-year annual statistics, not today's reading.
View current Boise air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Boise City, ID), 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.