Boise Air Quality in February
Across 2019–2025, Boise's February air quality had a median AQI of 52 (Moderate) over 198 monitored days in the Boise City, ID area. 0.0% of February days (0 of 198) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 93.9% of days. The cleanest February on record here was 2024 (median AQI 44, 0 days above 100) and the worst was 2022 (median 56, 0 days above 100, peak AQI 76).
- Good: 38.9%
- Moderate: 61.1%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
Reduce Indoor Ozone in Boise
Today's main pollutant in Boise is ground-level ozone (AQI 38). Important: standard HEPA filters do NOT remove ozone — only a purifier with a substantial activated-carbon bed adsorbs it. The biggest wins are cutting indoor sources (gas appliances, certain "ionizer" purifiers) and ventilating when outdoor ozone is low (early morning). A high-carbon unit helps with the gases and VOCs that linger indoors.
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How is the air in Boise in February?
Moderate on a typical day: median AQI 52 across 2019–2025, with 0.0% of February days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓38.9% of February days were Good (AQI 0–50), 61.1% Moderate (51–100).
- ✓0 days of 198 reached AQI 101+; the February peak was 90.
- ✓Best February: 2024; worst February: 2022.
Frequently asked questions
What is the air quality like in Boise in February?▾
Across 2019–2025, the median daily AQI in Boise in February was 52 (Moderate). 38.9% of days were Good, 61.1% Moderate, and 0.0% reached Unhealthy for Sensitive Groups or worse, based on 198 monitored days in EPA's Air Quality System.
Is February a good time for outdoor exercise in Boise?▾
A typical February day in Boise is Moderate (median AQI 52): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and fewer than 1% of February days reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Which pollutant causes Boise's February air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 93.9% of February days in Boise. The highest February AQI recorded in 2019–2025 was 90 (Moderate), in 2022.
Boise February air quality, year by year
Boise February air quality by year (Boise City, ID, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 28 | 54 | 0 | 90 | PM2.5 |
| 2020 | 29 | 53 | 0 | 66 | PM2.5 |
| 2021 | 28 | 52 | 0 | 61 | PM2.5 |
| 2022worst | 28 | 56 | 0 | 76 | PM2.5 |
| 2023 | 28 | 53 | 0 | 72 | PM2.5 |
| 2024cleanest | 29 | 44 | 0 | 58 | PM2.5 |
| 2025 | 28 | 54 | 0 | 74 | PM2.5 |
What February air means in Boise
A typical February day in Boise is Moderate (median AQI 52): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and fewer than 1% of February days reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
February's median AQI of 52 is in line with Boise's whole-year median of 54, so this period is neither a clean nor a dirty stretch for the area. Nationally, the median February AQI across every EPA metro area (87,428 metro-days, 2019–2025) is 41, so Boise runs above the national February norm; 0.0% of its February days topped AQI 100 versus 0.4% nationally (about the same).
February is part of Boise's winter season (December, January, February); the winter page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Boise
The latest EPA AirNow observation puts Boise's AQI at 38 (O3). The figures above are multi-year month 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.