Metro area air quality · 2025

Warren, PA

Median AQI 35 (Good). 78.7% of monitored days rated Good across this metro's EPA monitoring network.

35
Median AQI
78.7%
Good-air days
0
Unhealthy days
65%
Cleaner than US metros

Warren, PA posted a 2025 median AQI of 35 (Good) with 78.7% Good days

According to the U.S. EPA Air Quality System, the Warren, PA CBSA recorded a median AQI of 35 across 150 monitored days in 2025, with 78.7% 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 Warren, PA CBSA's 78.7% Good-day share places it cleaner than 65% of US metros in 2025.
Closest median-AQI peer
Baraboo, WI (75.6% Good, median AQI 35) is the closest nationwide median-AQI peer to Warren, PA.
Median AQI
Median AQI: 35
Good days
Good days: 78.7%

Aggregated from EPA Air Quality System (2025), 150 monitored days. EPA AQS →

The verdict

Warren, PA's median AQI 35 is in the lower (cleaner) CBSA tercile on this site. On the EPA scale the metro runs good, cleaner than the median US metro, with a median AQI of 35 and 78.7% of 150 monitored days in the Good band.

35
median AQI · Good
78.7%
days rated Good
65%
cleaner than US metros
138
worst single reading

No day crossed into the Unhealthy tier across the metro's monitors in 2025.

Warren, PA's median AQI 35 is in the lower (cleaner) CBSA tercile on this site. Signature read: median AQI 35 (low tercile vs CBSA corpus). Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 35 over 150 measured days in 2025 (Good / Good). The monitored-day split lands at 118 Good (79%), 29 Moderate (19%), and 3 Unhealthy-for-Sensitive-Groups (2%). The 90th-percentile AQI finished at 58; the highest single-day reading hit 138 (USG).

Across 2025–2025, Good-day share shifted an amount the record cannot support and median AQI moved +0 (tracked). No Unhealthy-tier days appear in this annual dataset. Metros with comparable AQI profiles include Baraboo, WI (75.6% good, AQI 35); Effingham, IL (95.5% good, AQI 35); Ithaca, NY (93.2% good, AQI 35).

Health effects of air pollution →

Air Quality Summary

Median AQI

35

Good

Good Days

78.7%

118 of 150 days

Max AQI

138

USG

Health Grade

Good

90th pct: 58

AQI Day Breakdown (2025)

Distribution of 150 monitored days across EPA AQI categories.

Good

118

79%

Moderate

29

19%

USG

3

2%

Unhealthy

0

0%

Very Unhealthy

0

0%

Hazardous

0

0%

Health Impact Assessment

Good

The Warren, PA metro area's air quality is rated Good based on 78.7% 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 Warren, PA metro compare?

How Warren, PA compares

Good-day share better than typical
Warren, PA 78.7%
Baraboo, WI 75.6%
Typical US metro 70.6%
Median AQI better than typical
Warren, PA 35
Baraboo, WI 35
Typical US metro 41
Unhealthy days / yr better than typical
Warren, PA 0
Baraboo, WI 1
Typical US metro 1

Metros with a similar median AQI

CBSA peers nationwide whose annual median AQI sits near Warren, PA (35).

Baraboo, WI

Median AQI 35 · 75.6% Good-day share

35

Effingham, IL

Median AQI 35 · 95.5% Good-day share

35

Ithaca, NY

Median AQI 35 · 93.2% Good-day share

35

Kinston, NC

Median AQI 35 · 97.5% Good-day share

35

Meridian, MS

Median AQI 35 · 94.6% Good-day share

35

Morehead City, NC

Median AQI 35 · 96.2% Good-day share

35

Metros with similar unhealthy-day exposure

A second relationship type: metros whose unhealthy-or-worse day count is closest to Warren, PA's 0 (independent of median AQI).

Aberdeen, SD

0 unhealthy-or-worse days · median AQI 27

27

Aberdeen, WA

0 unhealthy-or-worse days · median AQI 22

22

Adrian, MI

0 unhealthy-or-worse days · median AQI 41

41

Akron, OH

0 unhealthy-or-worse days · median AQI 45

45

Albany, GA

0 unhealthy-or-worse days · median AQI 46

46

Albany, OR

0 unhealthy-or-worse days · median AQI 27

27

Frequently Asked Questions

What does AQI 35 mean for health? ▼
An AQI of 35 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 Warren, PA have? ▼
In 2025, the Warren, PA metro area recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 138.
What is the air quality in the Warren, PA metro area? ▼
The Warren, PA metro area has a median Air Quality Index (AQI) of 35, rated "Good." 78.7% of monitored days (118 out of 150) had good air quality in 2025.
Is air quality in Warren, PA getting better or worse? ▼
Insufficient floor-qualifying trend data is available for the Warren, PA metro area (need ≥100 monitored days in at least two years).
How does Warren, PA compare to other metro areas? ▼
The Warren, PA metro has 78.7% good air days. Similar metros: Baraboo, WI (75.6% good), Effingham, IL (95.5% good), Ithaca, NY (93.2% good).
What is the 90th percentile AQI for Warren, PA? ▼
The 90th percentile AQI for the Warren, PA metro area is 58, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 138 (USG).

Data Sources

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