Metro area air quality · 2025

Canton-Massillon, OH

Median AQI 49 (Good). 53.1% of monitored days rated Good across this metro's EPA monitoring network.

49
Median AQI
53.1%
Good-air days
0
Unhealthy days
16%
Cleaner than US metros

Canton-Massillon, OH posted a 2025 median AQI of 49 (Good) with 53.1% Good days

According to the U.S. EPA Air Quality System, the Canton-Massillon, OH CBSA recorded a median AQI of 49 across 365 monitored days in 2025, with 53.1% 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 Canton-Massillon, OH CBSA's 53.1% Good-day share places it cleaner than 16% of US metros in 2025.
Closest median-AQI peer
Carlsbad-Artesia, NM (53.7% Good, median AQI 49) is the closest nationwide median-AQI peer to Canton-Massillon, OH.
2020–2025 Good-day shift
Canton-Massillon, OH's Good-day share moved -3.6 points from 2020 to 2025 (median AQI +2).
Median AQI
Median AQI: 49

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

The verdict

Canton-Massillon, OH lands in the lower Good-day tercile (53.1% 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 49 and 53.1% of 365 monitored days in the Good band.

49
median AQI · Good
53.1%
days rated Good
16%
cleaner than US metros
124
worst single reading

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

Annual release change

What changed in the 2025 EPA annual release

2024 → 2025
  • Canton-Massillon, OH metro's peak single-day AQI rose from 93 to 124 between the 2024 and 2025 EPA annual releases, a change of +31 points.

Compared against 366 monitored days in 2024 and 363 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

Canton-Massillon, OH lands in the lower Good-day tercile (53.1% Good), a thinner clean-air share than most CBSA peers here. Signature read: 53.1% 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 49 over 365 measured days in 2025 (Good / Moderate). The monitored-day split lands at 194 Good (53%), 169 Moderate (46%), and 2 Unhealthy-for-Sensitive-Groups (1%). The 90th-percentile AQI finished at 70; the highest single-day reading hit 124 (USG).

Across 2020–2025, Good-day share shifted -3.6 points and median AQI moved +2 (worsening). No Unhealthy-tier days appear in this annual dataset. Metros with comparable AQI profiles include Carlsbad-Artesia, NM (53.7% good, AQI 49); Chattanooga, TN-GA (51.0% good, AQI 49); Kingsville, TX (51.7% good, AQI 49).

Health effects of air pollution →

Air Quality Summary

Median AQI

49

Good

Good Days

53.1%

194 of 365 days

Max AQI

124

USG

Health Grade

Moderate

90th pct: 70

AQI Day Breakdown (2025)

Distribution of 365 monitored days across EPA AQI categories.

Good

194

53%

Moderate

169

46%

USG

2

1%

Unhealthy

0

0%

Very Unhealthy

0

0%

Hazardous

0

0%

Health Impact Assessment

Moderate

The Canton-Massillon, OH metro area's air quality is rated Moderate based on 53.1% 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 Canton-Massillon, OH metro compare?

How Canton-Massillon, OH compares

Good-day share worse than typical
Canton-Massillon, OH 53.1%
Carlsbad-Artesia, NM 53.7%
Typical US metro 70.6%
Median AQI worse than typical
Canton-Massillon, OH 49
Carlsbad-Artesia, NM 49
Typical US metro 41
Unhealthy days / yr better than typical
Canton-Massillon, OH 0
Carlsbad-Artesia, NM 1
Typical US metro 1

5-Year Air Quality Trend

Air quality is worsening in the Canton-Massillon, OH metro. Highest Good-day share: 2020 (57.1%, 202 of 354 monitored days).

Year Good Moderate Unhealthy Median AQI
2020 202 152 0 47
2021 154 208 0 53
2022 206 157 0 49
2023 163 192 1 52
2024 192 174 0 48
2025 194 169 0 49

Metros with a similar median AQI

CBSA peers nationwide whose annual median AQI sits near Canton-Massillon, OH (49).

Carlsbad-Artesia, NM

Median AQI 49 · 53.7% Good-day share

49

Chattanooga, TN-GA

Median AQI 49 · 51.0% Good-day share

49

Kingsville, TX

Median AQI 49 · 51.7% Good-day share

49

Laramie, WY

Median AQI 49 · 55.6% Good-day share

49

Miami, OK

Median AQI 49 · 53.7% Good-day share

49

New Orleans-Metairie, LA

Median AQI 49 · 51.8% Good-day share

49

Metros with similar unhealthy-day exposure

A second relationship type: metros whose unhealthy-or-worse day count is closest to Canton-Massillon, 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 Canton-Massillon, OH have? ▼
In 2025, the Canton-Massillon, OH metro area recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 124.
What is the air quality in the Canton-Massillon, OH metro area? ▼
The Canton-Massillon, OH metro area has a median Air Quality Index (AQI) of 49, rated "Good." 53.1% of monitored days (194 out of 365) had good air quality in 2025.
Is air quality in Canton-Massillon, OH getting better or worse? ▼
Air quality in the Canton-Massillon, OH metro is worsening across floor-qualifying years (2020-2025); years with fewer than 100 monitored days are excluded from that direction. Highest qualifying Good-day share: 2020 at 57.1% (202 of 354 days). Lowest qualifying Good-day share: 2021 at 42.5% (154 of 362 days).
What does AQI 49 mean for health? ▼
An AQI of 49 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 Canton-Massillon, OH compare to other metro areas? ▼
The Canton-Massillon, OH metro has 53.1% good air days. Similar metros: Carlsbad-Artesia, NM (53.7% good), Chattanooga, TN-GA (51.0% good), Kingsville, TX (51.7% good).
What is the 90th percentile AQI for Canton-Massillon, OH? ▼
The 90th percentile AQI for the Canton-Massillon, OH metro area is 70, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 124 (USG).

Data Sources

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