Metro area air quality · 2025

Grants Pass, OR

Median AQI 33 (Good). 68.2% of monitored days rated Good across this metro's EPA monitoring network.

33
Median AQI
68.2%
Good-air days
2
Unhealthy days
41%
Cleaner than US metros

Grants Pass, OR posted a 2025 median AQI of 33 (Good) with 68.2% Good days

According to the U.S. EPA Air Quality System, the Grants Pass, OR CBSA recorded a median AQI of 33 across 365 monitored days in 2025, with 68.2% rated Good and 2 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 Grants Pass, OR CBSA's 68.2% Good-day share places it cleaner than 41% of US metros in 2025.
Closest median-AQI peer
Bangor, ME (84.2% Good, median AQI 33) is the closest nationwide median-AQI peer to Grants Pass, OR.
2020–2025 Good-day shift
Grants Pass, OR's Good-day share moved +5.1 points from 2020 to 2025 (median AQI -2).
Median AQI
Median AQI: 33

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

The verdict

Grants Pass, OR's median AQI 33 is in the lower (cleaner) CBSA tercile on this site. On the EPA scale the metro runs good, more polluted than the median US metro, with a median AQI of 33 and 68.2% of 365 monitored days in the Good band.

33
median AQI · Good
68.2%
days rated Good
41%
cleaner than US metros
208
worst single reading

2 days reached Unhealthy or worse across the metro's monitors in 2025.

Annual release change

What changed in the 2025 EPA annual release

2024 → 2025
  • Grants Pass, OR metro's Good-day share fell from 79.3% to 69.6% between the 2024 and 2025 EPA annual releases, a change of -9.8 percentage points.
  • Grants Pass, OR metro's peak single-day AQI rose from 146 to 208 between the 2024 and 2025 EPA annual releases, a change of +62 points.
  • Grants Pass, OR metro's median AQI rose from 29 to 33 between the 2024 and 2025 EPA annual releases, a change of +4 points.
  • Grants Pass, OR metro's Unhealthy-category days rose from 0 to 1 between the 2024 and 2025 EPA annual releases, a change of +1 days.

Compared against 358 monitored days in 2024 and 358 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

Grants Pass, OR's median AQI 33 is in the lower (cleaner) CBSA tercile on this site. Signature read: median AQI 33 (low tercile vs CBSA corpus). Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 33 over 365 measured days in 2025 (Good / Moderate). The monitored-day split lands at 249 Good (68%), 108 Moderate (30%), and 6 Unhealthy-for-Sensitive-Groups (2%). The 90th-percentile AQI finished at 67; the highest single-day reading hit 208 (Very Unhealthy).

Across 2020–2025, Good-day share shifted +5.1 points and median AQI moved -2 (improving). The annual record contains 2 days at Unhealthy or worse. Metros with comparable AQI profiles include Bangor, ME (84.2% good, AQI 33); Clarksburg, WV (72.4% good, AQI 33); Lawrenceburg, TN (81.5% good, AQI 33).

Health effects of air pollution →

Air Quality Summary

Median AQI

33

Good

Good Days

68.2%

249 of 365 days

Max AQI

208

Very Unhealthy

Health Grade

Moderate

90th pct: 67

AQI Day Breakdown (2025)

Distribution of 365 monitored days across EPA AQI categories.

Good

249

68%

Moderate

108

30%

USG

6

2%

Unhealthy

1

0%

Very Unhealthy

1

0%

Hazardous

0

0%

Health Impact Assessment

Moderate

The Grants Pass, OR metro area's air quality is rated Moderate based on 68.2% good air days. There were 2 unhealthy days in 2025 when outdoor activity should be limited.

Air quality reached unhealthy levels on 2 days in 2025 (1 Unhealthy, 1 Very Unhealthy). Sensitive groups, including people with asthma, COPD, cardiovascular conditions, children, and adults over 65, should review the daily breakdown and follow local advisories.

Sensitive group advisory

People with asthma, COPD, heart disease, children, pregnant women, and adults 65+ should follow EPA AQI alerts daily and limit outdoor exertion when AQI exceeds 100. Real-time conditions: airnow.gov.

How does the Grants Pass, OR metro compare?

How Grants Pass, OR compares

Good-day share worse than typical
Grants Pass, OR 68.2%
Bangor, ME 84.2%
Typical US metro 70.6%
Median AQI better than typical
Grants Pass, OR 33
Bangor, ME 33
Typical US metro 41
Unhealthy days / yr worse than typical
Grants Pass, OR 2
Bangor, ME 1
Typical US metro 1

5-Year Air Quality Trend

Air quality is improving in the Grants Pass, OR metro. Highest Good-day share: 2024 (79.3%, 284 of 358 monitored days).

Year Good Moderate Unhealthy Median AQI
2020 228 112 14 35
2021 240 106 9 36
2022 208 142 6 39
2023 205 129 11 44
2024 284 74 0 29
2025 249 108 1 33

Metros with a similar median AQI

CBSA peers nationwide whose annual median AQI sits near Grants Pass, OR (33).

Bangor, ME

Median AQI 33 · 84.2% Good-day share

33

Clarksburg, WV

Median AQI 33 · 72.4% Good-day share

33

Lawrenceburg, TN

Median AQI 33 · 81.5% Good-day share

33

Roanoke Rapids, NC

Median AQI 33 · 78.1% Good-day share

33

Rockland, ME

Median AQI 33 · 97.8% Good-day share

33

Vallejo-Fairfield, CA

Median AQI 33 · 99.2% Good-day share

33

Metros with similar unhealthy-day exposure

A second relationship type: metros whose unhealthy-or-worse day count is closest to Grants Pass, OR's 2 (independent of median AQI).

Ardmore, OK

2 unhealthy-or-worse days · median AQI 45

45

Bridgeport-Stamford-Norwalk, CT

2 unhealthy-or-worse days · median AQI 44

44

Chattanooga, TN-GA

2 unhealthy-or-worse days · median AQI 49

49

Cincinnati, OH-KY-IN

2 unhealthy-or-worse days · median AQI 56

56

Columbus, GA-AL

2 unhealthy-or-worse days · median AQI 48

48

Davenport-Moline-Rock Island, IA-IL

2 unhealthy-or-worse days · median AQI 46

46

Frequently Asked Questions

What does AQI 33 mean for health? ▼
An AQI of 33 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 many unhealthy air days does Grants Pass, OR have? ▼
In 2025, the Grants Pass, OR metro area recorded 2 unhealthy air days (1 Unhealthy, 1 Very Unhealthy, 0 Hazardous). The maximum AQI reached 208.
What is the air quality in the Grants Pass, OR metro area? ▼
The Grants Pass, OR metro area has a median Air Quality Index (AQI) of 33, rated "Good." 68.2% of monitored days (249 out of 365) had good air quality in 2025.
Is air quality in Grants Pass, OR getting better or worse? ▼
Air quality in the Grants Pass, 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 79.3% (284 of 358 days). Lowest qualifying Good-day share: 2022 at 58.4% (208 of 356 days).
How does Grants Pass, OR compare to other metro areas? ▼
The Grants Pass, OR metro has 68.2% good air days. Similar metros: Bangor, ME (84.2% good), Clarksburg, WV (72.4% good), Lawrenceburg, TN (81.5% good).
What is the 90th percentile AQI for Grants Pass, OR? ▼
The 90th percentile AQI for the Grants Pass, OR metro area is 67, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 208 (Very Unhealthy).

Data Sources

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