Metro area air quality · 2025
La Grande, OR
Median AQI 27 (Good). 84.4% of monitored days rated Good across this metro's EPA monitoring network.
- 27
- Median AQI
- 84.4%
- Good-air days
- 0
- Unhealthy days
- 76%
- Cleaner than US metros
La Grande, OR posted a 2025 median AQI of 27 (Good) with 84.4% Good days
According to the U.S. EPA Air Quality System, the La Grande, OR CBSA recorded a median AQI of 27 across 353 monitored days in 2025, with 84.4% rated Good and 0 unhealthy or worse. This is an annual metro comparison, not a live advisory.
Data source EPA Air Quality System (AQS)
- Cleaner than US metros
- The La Grande, OR CBSA's 84.4% Good-day share places it cleaner than 76% of US metros in 2025.
- Closest median-AQI peer
- Aberdeen, SD (83.6% Good, median AQI 27) is the closest nationwide median-AQI peer to La Grande, OR.
- 2020–2025 Good-day shift
- La Grande, OR's Good-day share moved +1.3 points from 2020 to 2025 (median AQI +0).
- Median AQI
- Median AQI: 27
Aggregated from EPA Air Quality System (2025), 353 monitored days. EPA AQS →
The verdict
The La Grande, OR metro runs good on the EPA scale, cleaner than most US metros, a median AQI of 27 with 84.4% of 353 monitored days in the Good band.
- 27
- median AQI · Good
- 84.4%
- days rated Good
- 76%
- cleaner than US metros
- 79
- worst single reading
No day crossed into the Unhealthy tier across the metro's monitors in 2025.
Annual release change
What changed in the 2025 EPA annual release
- La Grande, OR metro's peak single-day AQI fell from 128 to 79 between the 2024 and 2025 EPA annual releases, a change of -49 points.
- La Grande, OR metro's median AQI rose from 23 to 27 between the 2024 and 2025 EPA annual releases, a change of +4 points.
- La Grande, OR metro's Good-day share rose from 83.2% to 84.4% between the 2024 and 2025 EPA annual releases, a change of +1.2 percentage points.
Insights: La Grande, OR metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 27 over 353 measured days in 2025, which corresponds to a Good band and a Good metro-wide health grade. The monitored-day split lands at 298 Good days (84%), 55 Moderate (16%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 54 while the highest single-day reading hit 79 (Moderate). Metro residents averaged roughly 25.3 clean-air days per 30-day window across the reporting year.
Across the 2020–2025 trend window, the share of monitored days rated Good shifted by +1.3 points and the median AQI moved +0 points, which classifies the multi-year trajectory as stable. The metro recorded no Unhealthy-tier days in this annual dataset. Metros with comparable AQI profiles include Aberdeen, SD (83.6% good, AQI 27); Albany, OR (80.0% good, AQI 27); Anchorage, AK (77.5% good, AQI 27).
Air Quality Summary
Median AQI
27
Good
Good Days
84.4%
298 of 353 days
Max AQI
79
Moderate
Health Grade
Good
90th pct: 54
AQI Day Breakdown (2025)
Distribution of 353 monitored days across EPA AQI categories.
Good
298
84%
Moderate
55
16%
USG
0
0%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Health Impact Assessment
The La Grande, OR metro area's air quality is rated Good based on 84.4% 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 La Grande, OR metro compare?
How La Grande, OR compares
5-Year Air Quality Trend
Air quality is stable in the La Grande, OR metro. Best year: 2023 (305 good days).
| Year | Good | Moderate | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|
| 2020 | 300 | 57 | 4 | 27 | 326 |
| 2021 | 304 | 49 | 2 | 27 | 170 |
| 2022 | 283 | 74 | 0 | 28 | 130 |
| 2023 | 305 | 56 | 0 | 26 | 95 |
| 2024 | 303 | 61 | 0 | 23 | 128 |
| 2025 | 298 | 55 | 0 | 27 | 79 |
Metros with a similar median AQI
CBSA peers nationwide whose annual median AQI sits near La Grande, OR (27).
Aberdeen, SD
Median AQI 27 · 83.6% Good-day share
Albany, OR
Median AQI 27 · 80.0% Good-day share
Anchorage, AK
Median AQI 27 · 77.5% Good-day share
Olympia-Tumwater, WA
Median AQI 27 · 93.5% Good-day share
Sheridan, WY
Median AQI 27 · 89.1% Good-day share
Utica-Rome, NY
Median AQI 27 · 84.4% Good-day share
Metros with similar unhealthy-day exposure
A second relationship type: metros whose unhealthy-or-worse day count is closest to La Grande, OR's 0 (independent of median AQI).
Aberdeen, WA
0 unhealthy-or-worse days · median AQI 22
Adrian, MI
0 unhealthy-or-worse days · median AQI 41
Akron, OH
0 unhealthy-or-worse days · median AQI 45
Albany, GA
0 unhealthy-or-worse days · median AQI 46
Albany-Schenectady-Troy, NY
0 unhealthy-or-worse days · median AQI 41
Alexandria, LA
0 unhealthy-or-worse days · median AQI 37
More Air Quality Data
Explore EPA air quality rankings and guides across U.S. metros and counties.
Cleanest Metro Areas
U.S. metros ranked by their share of Good air-quality days.
Worst Air Quality
Counties and metros with the most unhealthy air days.
All Metro Areas
Annual AQI by CBSA for every monitored U.S. metro area.
Best and Worst City Air
What drives urban air quality and how metro areas compare.
Air Quality Guides
Frequently Asked Questions
What is the air quality in the La Grande, OR metro area? ▼
How many unhealthy air days does La Grande, OR have? ▼
Is air quality in La Grande, OR getting better or worse? ▼
What does AQI 27 mean for health? ▼
What is the 90th percentile AQI for La Grande, OR? ▼
How does La Grande, 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
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Every figure on PlainAirData 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.