Metro area air quality · 2025

Eugene, OR

Median AQI 46 (Good). 56.4% of monitored days rated Good across this metro's EPA monitoring network.

46
Median AQI
56.4%
Good-air days
1
Unhealthy days
19%
Cleaner than US metros

Eugene, OR posted a 2025 median AQI of 46 (Good) with 56.4% Good days

According to the U.S. EPA Air Quality System, the Eugene, OR CBSA recorded a median AQI of 46 across 365 monitored days in 2025, with 56.4% rated Good and 1 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 Eugene, OR CBSA's 56.4% Good-day share places it cleaner than 19% of US metros in 2025.
Closest median-AQI peer
Albany, GA (57.3% Good, median AQI 46) is the closest nationwide median-AQI peer to Eugene, OR.
2020–2025 Good-day shift
Eugene, OR's Good-day share moved -0.4 points from 2020 to 2025 (median AQI +0).
Median AQI
Median AQI: 46

Aggregated from EPA Air Quality System (2025), 365 monitored days. EPA AQS →

The verdict

Eugene, OR lands in the lower Good-day tercile (56.4% Good), a thinner clean-air share than most CBSA peers here. On the EPA scale the metro runs good, among the more polluted US metros, with a median AQI of 46 and 56.4% of 365 monitored days in the Good band.

46
median AQI · Good
56.4%
days rated Good
19%
cleaner than US metros
153
worst single reading

1 day reached Unhealthy or worse across the metro's monitors in 2025.

Annual release change

What changed in the 2025 EPA annual release

2024 → 2025
  • Eugene, OR metro's peak single-day AQI fell from 216 to 153 between the 2024 and 2025 EPA annual releases, a change of -63 points.
  • Eugene, OR metro's Good-day share fell from 61.7% to 57.2% between the 2024 and 2025 EPA annual releases, a change of -4.5 percentage points.
  • Eugene, OR metro's Unhealthy-category days fell from 5 to 1 between the 2024 and 2025 EPA annual releases, a change of -4 days.

Compared against 355 monitored days in 2024 and 360 in 2025. These are arithmetic differences between two stored EPA annual summaries, not a cause claim or a live advisory.

National release changes Two-year CSV

Eugene, OR lands in the lower Good-day tercile (56.4% Good), a thinner clean-air share than most CBSA peers here. Signature read: 56.4% Good-day share (low tercile vs CBSA corpus). Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 46 over 365 measured days in 2025 (Good / Moderate). The monitored-day split lands at 206 Good (56%), 153 Moderate (42%), and 5 Unhealthy-for-Sensitive-Groups (1%). The 90th-percentile AQI finished at 68; the highest single-day reading hit 153 (Unhealthy).

Across 2020–2025, Good-day share shifted -0.4 points and median AQI moved +0 (stable). The annual record contains 1 day at Unhealthy or worse. Metros with comparable AQI profiles include Albany, GA (57.3% good, AQI 46); Athens-Clarke County, GA (57.8% good, AQI 46); Brookings, SD (58.6% good, AQI 46).

Health effects of air pollution →

Air Quality Summary

Median AQI

46

Good

Good Days

56.4%

206 of 365 days

Max AQI

153

Unhealthy

Health Grade

Moderate

90th pct: 68

AQI Day Breakdown (2025)

Distribution of 365 monitored days across EPA AQI categories.

Good

206

56%

Moderate

153

42%

USG

5

1%

Unhealthy

1

0%

Very Unhealthy

0

0%

Hazardous

0

0%

Health Impact Assessment

Moderate

The Eugene, OR metro area's air quality is rated Moderate based on 56.4% good air days. There were 1 unhealthy days in 2025 when outdoor activity should be limited.

Air quality is acceptable most days, but 5 days reached "Unhealthy for Sensitive Groups" and peak AQI reached 153. Sensitive groups should monitor real-time conditions at AirNow.gov.

How does the Eugene, OR metro compare?

How Eugene, OR compares

Good-day share worse than typical
Eugene, OR 56.4%
Albany, GA 57.3%
Typical US metro 70.6%
Median AQI worse than typical
Eugene, OR 46
Albany, GA 46
Typical US metro 41
Unhealthy days / yr about typical
Eugene, OR 1
Albany, GA 0
Typical US metro 1

5-Year Air Quality Trend

Air quality is stable in the Eugene, OR metro. Highest Good-day share: 2024 (61.7%, 219 of 355 monitored days).

Year Good Moderate Unhealthy Median AQI
2020 203 149 0 46
2021 214 131 13 44
2022 194 132 14 44
2023 190 159 6 49
2024 219 131 5 44
2025 206 153 1 46

Metros with a similar median AQI

CBSA peers nationwide whose annual median AQI sits near Eugene, OR (46).

Albany, GA

Median AQI 46 · 57.3% Good-day share

46

Athens-Clarke County, GA

Median AQI 46 · 57.8% Good-day share

46

Brookings, SD

Median AQI 46 · 58.6% Good-day share

46

Chico, CA

Median AQI 46 · 65.2% Good-day share

46

Colorado Springs, CO

Median AQI 46 · 68.2% Good-day share

46

Davenport-Moline-Rock Island, IA-IL

Median AQI 46 · 56.7% Good-day share

46

Metros with similar unhealthy-day exposure

A second relationship type: metros whose unhealthy-or-worse day count is closest to Eugene, OR's 1 (independent of median AQI).

Ann Arbor, MI

1 unhealthy-or-worse days · median AQI 41

41

Bangor, ME

1 unhealthy-or-worse days · median AQI 33

33

Baraboo, WI

1 unhealthy-or-worse days · median AQI 35

35

Bartlesville, OK

1 unhealthy-or-worse days · median AQI 44

44

Beaumont-Port Arthur, TX

1 unhealthy-or-worse days · median AQI 52

52

Beaver Dam, WI

1 unhealthy-or-worse days · median AQI 40

40

Frequently Asked Questions

How many unhealthy air days does Eugene, OR have? ▼
In 2025, the Eugene, OR metro area recorded 1 unhealthy air days (1 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 153.
What is the air quality in the Eugene, OR metro area? ▼
The Eugene, OR metro area has a median Air Quality Index (AQI) of 46, rated "Good." 56.4% of monitored days (206 out of 365) had good air quality in 2025.
Is air quality in Eugene, OR getting better or worse? ▼
Air quality in the Eugene, OR metro is stable across floor-qualifying years (2020-2025); years with fewer than 100 monitored days are excluded from that direction. Highest qualifying Good-day share: 2024 at 61.7% (219 of 355 days). Lowest qualifying Good-day share: 2023 at 53.5% (190 of 355 days).
What does AQI 46 mean for health? ▼
An AQI of 46 is "Good", air quality is satisfactory and poses little or no health risk. This is the best category on the EPA's AQI scale.
How does Eugene, OR compare to other metro areas? ▼
The Eugene, OR metro has 56.4% good air days. Similar metros: Albany, GA (57.3% good), Athens-Clarke County, GA (57.8% good), Brookings, SD (58.6% good).
What is the 90th percentile AQI for Eugene, OR? ▼
The 90th percentile AQI for the Eugene, OR metro area is 68, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 153 (Unhealthy).

Data Sources

Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset for Eugene, 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, Eugene, OR · 2020–2025