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
La Grande, OR sits in the upper Good-day tercile among EPA CBSA metros on this site (84.4% of 353 monitored days). On the EPA scale the metro runs good, cleaner than most US metros, with a median AQI of 27 and 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.
La Grande, OR sits in the upper Good-day tercile among EPA CBSA metros on this site (84.4% of 353 monitored days). Signature read: 84.4% Good-day share (high tercile vs CBSA corpus). Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 27 over 353 measured days in 2025 (Good / Good). The monitored-day split lands at 298 Good (84%), 55 Moderate (16%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 54; the highest single-day reading hit 79 (Moderate).
Across 2020–2025, Good-day share shifted +1.3 points and median AQI moved +0 (stable). No Unhealthy-tier days appear 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. Highest Good-day share: 2021 (85.6%, 304 of 355 monitored 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
Frequently Asked Questions
How many unhealthy air days does La Grande, OR have? ▼
What is the air quality in the La Grande, OR metro area? ▼
Is air quality in La Grande, OR getting better or worse? ▼
What does AQI 27 mean for health? ▼
How does La Grande, OR compare to other metro areas? ▼
What is the 90th percentile AQI for La Grande, OR? ▼
Data Sources
Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset for La Grande, OR, 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, La Grande, OR · 2020–2025