Metro area air quality · 2025
Canton-Massillon, OH
Median AQI 51 (Moderate). 49.5% of monitored days rated Good across this metro's EPA monitoring network.
- 51
- Median AQI
- 49.5%
- Good-air days
- 0
- Unhealthy days
- 11%
- Cleaner than US metros
Aggregated from EPA Air Quality System (2025), 273 monitored days. EPA AQS →
The verdict
The Canton-Massillon, OH metro runs moderate on the EPA scale, among the more polluted US metros, a median AQI of 51 with 49.5% of 273 monitored days in the Good band.
- 51
- median AQI · Moderate
- 49.5%
- days rated Good
- 11%
- cleaner than US metros
- 124
- worst single reading
No day crossed into the Unhealthy tier across the metro's monitors in 2025.
Insights: Canton-Massillon, OH metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 51 over 273 measured days in 2025, which corresponds to a Moderate band and a Poor metro-wide health grade. The monitored-day split lands at 135 Good days (49%), 136 Moderate (50%), and 2 Unhealthy-for-Sensitive-Groups (1%). The 90th-percentile AQI finished at 72 while the highest single-day reading hit 124 (USG). Metro residents averaged roughly 14.8 clean-air days per 30-day window across the reporting year.
Across the 2020–2025 trend window, good days shifted by -67 and the median AQI moved +4 points, which classifies the multi-year trajectory as worsening. The metro avoided any Unhealthy-tier days entirely, an outcome that typically reflects favorable wind patterns, lower industrial density, or effective regional emission controls. Metros with comparable AQI profiles include Augusta-Richmond County, GA-SC (47.6% good, AQI 51); Carlsbad-Artesia, NM (46.9% good, AQI 51); Charlotte-Concord-Gastonia, NC-SC (46.9% good, AQI 51).
Air Quality Summary
Median AQI
51
Moderate
Good Days
49.5%
135 of 273 days
Max AQI
124
USG
Health Grade
Poor
90th pct: 72
AQI Day Breakdown (2025)
Distribution of 273 monitored days across EPA AQI categories.
Good
135
49%
Moderate
136
50%
USG
2
1%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Health Impact Assessment
The Canton-Massillon, OH metro area's air quality is rated Poor based on 49.5% 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
5-Year Air Quality Trend
Air quality is worsening in the Canton-Massillon, OH metro. Best year: 2022 (206 good days).
| Year | Good | Moderate | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|
| 2020 | 202 | 152 | 0 | 47 | 119 |
| 2021 | 154 | 208 | 0 | 53 | 127 |
| 2022 | 206 | 157 | 0 | 49 | 136 |
| 2023 | 163 | 192 | 1 | 52 | 283 |
| 2024 | 192 | 174 | 0 | 48 | 93 |
| 2025 | 135 | 136 | 0 | 51 | 124 |
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Air Quality Guides
Frequently Asked Questions
What is the air quality in the Canton-Massillon, OH metro area? ▼
How many unhealthy air days does Canton-Massillon, OH have? ▼
Is air quality in Canton-Massillon, OH getting better or worse? ▼
What does AQI 51 mean for health? ▼
What is the 90th percentile AQI for Canton-Massillon, OH? ▼
How does Canton-Massillon, OH compare to other metro areas? ▼
Data Sources
Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset, 2020–2025. 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 files (metro-level) · 2020–2025
Every figure on PlainAir is rendered directly from EPA AQS air-quality monitoring data, no number is typed in by an editor. This page draws directly on EPA AQS air-quality monitoring data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.