Metro area air quality · 2025

Medford, OR

Median AQI 43 (Good). 66.3% of monitored days rated Good across this metro's EPA monitoring network.

Compiled by PlainAirData · August 23, 2026

43
Median AQI: 66.3%
Good-air days: 1
Unhealthy days: 37%
Cleaner than US metros

Medford, OR posted a 2025 median AQI of 43 (Good) with 66.3% Good days

According to the U.S. EPA Air Quality System, the Medford, OR CBSA recorded a median AQI of 43 across 365 monitored days in 2025, with 66.3% 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 Medford, OR CBSA's 66.3% Good-day share places it cleaner than 37% of US metros in 2025.
Closest median-AQI peer: Ashtabula, OH (81.2% Good, median AQI 43) is the closest nationwide median-AQI peer to Medford, OR.
2020–2025 Good-day shift: Medford, OR's Good-day share moved +5.1 points from 2020 to 2025 (median AQI -1).
Median AQI: Median AQI: 43

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

The verdict

Medford, OR's peak reading 152 is in the upper max-AQI tercile among CBSA metros here. On the EPA scale the metro runs good, more polluted than the median US metro, with a median AQI of 43 and 66.3% of 365 monitored days in the Good band.

43
median AQI · Good: 66.3%
days rated Good: 37%
cleaner than US metros: 152
worst single reading

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

Medford, OR metro's Good-day share fell from 72.4% to 66.5% between the 2024 and 2025 EPA annual releases, a change of -5.9 percentage points.

Medford, OR's peak reading 152 is in the upper max-AQI tercile among CBSA metros here. Signature read: peak AQI 152 (high tercile vs CBSA corpus). Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 43 over 365 measured days in 2025 (Good / Moderate). The monitored-day split lands at 242 Good (66%), 121 Moderate (33%), and 1 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 67; the highest single-day reading hit 152 (Unhealthy).

Across 2020–2025, Good-day share shifted +5.1 points and median AQI moved -1 (improving). The annual record contains 1 day at Unhealthy or worse. Metros with comparable AQI profiles include Ashtabula, OH (81.2% good, AQI 43); Bloomington, IN (67.7% good, AQI 43); Champaign-Urbana, IL (65.8% good, AQI 43).

Health effects of air pollution →

Air Quality Summary

Median AQI

Good

Good Days

66.3%

242 of 365 days

Max AQI

152

Unhealthy

Health Grade

Moderate

90th pct: 67

AQI Day Breakdown (2025)

Distribution of 365 monitored days across EPA AQI categories.

Good

242

66%

Moderate

121

33%

USG

Unhealthy

Very Unhealthy

Hazardous

Health Impact Assessment

Moderate

The Medford, OR metro area's air quality is rated Moderate based on 66.3% good air days. There were 1 unhealthy days in 2025 when outdoor activity should be limited.

Air quality is acceptable most days, but 1 days reached "Unhealthy for Sensitive Groups" and peak AQI reached 152. Sensitive groups should monitor real-time conditions at AirNow.gov.

How does the Medford, OR metro compare?

How Medford, OR compares

Compare against

Good-day share worse than typical

Medford, OR 66.3%

Ashtabula, OH 81.2%

Typical US metro 70.6%

Median AQI worse than typical

Medford, OR 43

Ashtabula, OH 43

Typical US metro 41

Unhealthy days / yr about typical

Medford, OR 1

Ashtabula, OH 0

Typical US metro 1

5-Year Air Quality Trend

Air quality is improving in the Medford, OR metro. Highest Good-day share: 2024 (72.4%, 262 of 362 monitored days).

Year	Good	Moderate	Unhealthy	Median AQI	Max AQI
2020	218	133	4	44	900
2021	204	126	19	48	266
2022	211	146	3	44	165
2023	216	135	7	45	237
2024	262	99	1	41	155
2025	242	121	1	43	152

Metros with a similar median AQI

CBSA peers nationwide whose annual median AQI sits near Medford, OR (43).

Ashtabula, OH

Median AQI 43 · 81.2% Good-day share

Bloomington, IN

Median AQI 43 · 67.7% Good-day share

Champaign-Urbana, IL

Median AQI 43 · 65.8% Good-day share

Cleveland, MS

Median AQI 43 · 71.9% Good-day share

Columbus, IN

Median AQI 43 · 72.6% Good-day share

Durham-Chapel Hill, NC

Median AQI 43 · 71.5% Good-day share

Metros with similar unhealthy-day exposure

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

Ann Arbor, MI

1 unhealthy-or-worse days · median AQI 41

Bangor, ME

1 unhealthy-or-worse days · median AQI 33

Baraboo, WI

1 unhealthy-or-worse days · median AQI 35

Bartlesville, OK

1 unhealthy-or-worse days · median AQI 44

Beaumont-Port Arthur, TX

1 unhealthy-or-worse days · median AQI 52

Beaver Dam, WI

1 unhealthy-or-worse days · median AQI 40

Frequently Asked Questions

What is the 90th percentile AQI for Medford, OR? ▼

The 90th percentile AQI for the Medford, OR metro area is 67, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 152 (Unhealthy).

How many unhealthy air days does Medford, OR have? ▼

In 2025, the Medford, OR metro area recorded 1 unhealthy air days (1 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 152.

What is the air quality in the Medford, OR metro area? ▼

The Medford, OR metro area has a median Air Quality Index (AQI) of 43, rated "Good." 66.3% of monitored days (242 out of 365) had good air quality in 2025.

Is air quality in Medford, OR getting better or worse? ▼

Air quality in the Medford, OR metro is improving 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 72.4% (262 of 362 days). Lowest qualifying Good-day share: 2021 at 58.5% (204 of 349 days).

What does AQI 43 mean for health? ▼

An AQI of 43 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 Medford, OR compare to other metro areas? ▼

The Medford, OR metro has 66.3% good air days. Similar metros: Ashtabula, OH (81.2% good), Bloomington, IN (67.7% good), Champaign-Urbana, IL (65.8% good).

Data Sources

Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset for Medford, 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, Medford, OR · 2020–2025 Accessed 2026-07-06