Metro area air quality · 2025
Prineville, OR
Median AQI 24 (Good). 80.7% of monitored days rated Good across this metro's EPA monitoring network.
- 24
- Median AQI
- 80.7%
- Good-air days
- 0
- Unhealthy days
- 65%
- Cleaner than US metros
Aggregated from EPA Air Quality System (2025), 181 monitored days. EPA AQS →
The verdict
The Prineville, OR metro runs good on the EPA scale, cleaner than the median US metro, a median AQI of 24 with 80.7% of 181 monitored days in the Good band.
- 24
- median AQI · Good
- 80.7%
- days rated Good
- 65%
- cleaner than US metros
- 75
- worst single reading
No day crossed into the Unhealthy tier across the metro's monitors in 2025.
Insights: Prineville, OR metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 24 over 181 measured days in 2025, which corresponds to a Good band and a Good metro-wide health grade. The monitored-day split lands at 146 Good days (81%), 35 Moderate (19%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 55 while the highest single-day reading hit 75 (Moderate). Metro residents averaged roughly 24.2 clean-air days per 30-day window across the reporting year.
Across the 2020–2025 trend window, good days shifted by -115 and the median AQI moved -4 points, which classifies the multi-year trajectory as improving. The metro avoided any Unhealthy-tier days entirely, an outcome that typically reflects favorable wind patterns, lower industrial density, or effective regional emission controls. Metros with comparable AQI profiles include Albany, OR (84.5% good, AQI 24); Coeur d'Alene, ID (88.4% good, AQI 24); Moscow, ID (99.3% good, AQI 24).
Air Quality Summary
Median AQI
24
Good
Good Days
80.7%
146 of 181 days
Max AQI
75
Moderate
Health Grade
Good
90th pct: 55
AQI Day Breakdown (2025)
Distribution of 181 monitored days across EPA AQI categories.
Good
146
81%
Moderate
35
19%
USG
0
0%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Health Impact Assessment
The Prineville, OR metro area's air quality is rated Good based on 80.7% good air days. No unhealthy air days were recorded in 2025.
Air quality is generally acceptable. Unusually sensitive people should monitor real-time conditions at AirNow.gov during high-pollution events.
How does the Prineville, OR metro compare?
How Prineville, OR compares
5-Year Air Quality Trend
Air quality is improving in the Prineville, OR metro. Best year: 2022 (288 good days).
| Year | Good | Moderate | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|
| 2020 | 261 | 97 | 1 | 28 | 1033 |
| 2021 | 281 | 75 | 3 | 28 | 190 |
| 2022 | 288 | 69 | 0 | 24 | 128 |
| 2023 | 267 | 86 | 6 | 33 | 171 |
| 2024 | 282 | 76 | 3 | 24 | 173 |
| 2025 | 146 | 35 | 0 | 24 | 75 |
Metros with Similar Air Quality
Metro areas across the US with a similar median AQI to Prineville, OR.
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Worst Air Quality
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All Metro Areas
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Best and Worst City Air
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Air Quality Guides
Frequently Asked Questions
What is the air quality in the Prineville, OR metro area? ▼
How many unhealthy air days does Prineville, OR have? ▼
Is air quality in Prineville, OR getting better or worse? ▼
What does AQI 24 mean for health? ▼
What is the 90th percentile AQI for Prineville, OR? ▼
How does Prineville, OR compare to other metro areas? ▼
Data Sources
Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset, 2020–2025. See our methodology for how AQI, median, and coverage figures are computed.
Read our methodology , how this data is sourced, computed, and verified.
Source: U.S. EPA Air Quality System (AQS) Annual AQI by CBSA summary files (metro-level) · 2020–2025
Every figure on PlainAir is rendered directly from EPA AQS air-quality monitoring data, no number is typed in by an editor. This page draws directly on EPA AQS air-quality monitoring data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.