Metro area air quality · 2025

Salem, OH

Median AQI 12 (Good). 100.0% of monitored days rated Good across this metro's EPA monitoring network.

12
Median AQI
100.0%
Good-air days
0
Unhealthy days

Salem, OH posted a 2025 median AQI of 12 (Good) with 100.0% Good days

According to the U.S. EPA Air Quality System, the Salem, OH CBSA recorded a median AQI of 12 across 61 monitored days in 2025, with 100.0% rated Good and 0 unhealthy or worse. This is an annual metro comparison, not a live advisory.

Data source EPA Air Quality System (AQS)

Closest median-AQI peer
Bozeman, MT (98.1% Good, median AQI 11) is the closest nationwide median-AQI peer to Salem, OH.
2020–2025 Good-day shift
Salem, OH's Good-day share moved +0.0 points from 2020 to 2025 (median AQI +2).
Median AQI
Median AQI: 12
Good days
Good days: 100.0%

Aggregated from EPA Air Quality System (2025), 61 monitored days. EPA AQS →

The verdict

Salem, OH sits in the upper Good-day tercile among EPA CBSA metros on this site (100.0% of 61 monitored days). On the EPA scale the metro runs good, with a median AQI of 12 and 100.0% of 61 monitored days in the Good band.

12
median AQI · Good
100.0%
days rated Good
31
worst single reading

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

Salem, OH sits in the upper Good-day tercile among EPA CBSA metros on this site (100.0% of 61 monitored days). Signature read: 100.0% 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 12 over 61 measured days in 2025 (Good / Excellent). The monitored-day split lands at 61 Good (100%), 0 Moderate (0%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 22; the highest single-day reading hit 31 (Good).

Across 2020–2025, Good-day share shifted +0.0 points and median AQI moved +2 (tracked). No Unhealthy-tier days appear in this annual dataset. Metros with comparable AQI profiles include Bozeman, MT (98.1% good, AQI 11); Show Low, AZ (99.5% good, AQI 13); Havre, MT (92.1% good, AQI 14).

Best and worst city air quality →

Air Quality Summary

Median AQI

12

Good

Good Days

100.0%

61 of 61 days

Max AQI

31

Good

Health Grade

Excellent

90th pct: 22

AQI Day Breakdown (2025)

Distribution of 61 monitored days across EPA AQI categories.

Good

61

100%

Moderate

0

0%

USG

0

0%

Unhealthy

0

0%

Very Unhealthy

0

0%

Hazardous

0

0%

Health Impact Assessment

Excellent

The Salem, OH metro area's air quality is rated Excellent based on 100.0% 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 Salem, OH metro compare?

How Salem, OH compares

Good-day share better than typical
Salem, OH 100.0%
Bozeman, MT 98.1%
Typical US metro 70.6%
Median AQI better than typical
Salem, OH 12
Bozeman, MT 11
Typical US metro 41
Unhealthy days / yr better than typical
Salem, OH 0
Bozeman, MT 0
Typical US metro 1

5-Year Air Quality Trend

Air quality is being tracked in the Salem, OH metro.

Year Good Moderate Unhealthy Median AQI
2020 48 0 0 10
2021 61 0 0 16
2022 61 0 0 12
2023 60 1 0 11
2024 63 0 0 12
2025 61 0 0 12

Metros with a similar median AQI

CBSA peers nationwide whose annual median AQI sits near Salem, OH (12).

Bozeman, MT

Median AQI 11 · 98.1% Good-day share

11

Show Low, AZ

Median AQI 13 · 99.5% Good-day share

13

Havre, MT

Median AQI 14 · 92.1% Good-day share

14

Evanston, WY

Median AQI 9 · 100.0% Good-day share

9

Mayaguez, PR

Median AQI 9 · 97.8% Good-day share

9

Santa Rosa, CA

Median AQI 9 · 100.0% Good-day share

9

Metros with similar unhealthy-day exposure

A second relationship type: metros whose unhealthy-or-worse day count is closest to Salem, OH'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

How many unhealthy air days does Salem, OH have? ▼
In 2025, the Salem, OH metro area recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 31.
What is the air quality in the Salem, OH metro area? ▼
The Salem, OH metro area has a median Air Quality Index (AQI) of 12, rated "Good." 100.0% of monitored days (61 out of 61) had good air quality in 2025.
Is air quality in Salem, OH getting better or worse? ▼
Insufficient floor-qualifying trend data is available for the Salem, OH metro area (need ≥100 monitored days in at least two years).
What does AQI 12 mean for health? ▼
An AQI of 12 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 Salem, OH compare to other metro areas? ▼
The Salem, OH metro has 100.0% good air days. Similar metros: Bozeman, MT (98.1% good), Show Low, AZ (99.5% good), Havre, MT (92.1% good).
What is the 90th percentile AQI for Salem, OH? ▼
The 90th percentile AQI for the Salem, OH metro area is 22, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 31 (Good).

Data Sources

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