Metro area air quality · 2025

Ashtabula, OH

Median AQI 43 (Good). 81.2% of monitored days rated Good across this metro's EPA monitoring network.

43
Median AQI
81.2%
Good-air days
0
Unhealthy days
70%
Cleaner than US metros

Ashtabula, OH posted a 2025 median AQI of 43 (Good) with 81.2% Good days

According to the U.S. EPA Air Quality System, the Ashtabula, OH CBSA recorded a median AQI of 43 across 245 monitored days in 2025, with 81.2% 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 Ashtabula, OH CBSA's 81.2% Good-day share places it cleaner than 70% of US metros in 2025.
Closest median-AQI peer
Bloomington, IN (67.7% Good, median AQI 43) is the closest nationwide median-AQI peer to Ashtabula, OH.
2020–2025 Good-day shift
Ashtabula, OH's Good-day share moved -10.7 points from 2020 to 2025 (median AQI +6).
Median AQI
Median AQI: 43

Aggregated from EPA Air Quality System (2025), 245 monitored days. EPA AQS →

The verdict

The Ashtabula, OH metro runs good on the EPA scale, cleaner than the median US metro, a median AQI of 43 with 81.2% of 245 monitored days in the Good band.

43
median AQI · Good
81.2%
days rated Good
70%
cleaner than US metros
122
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
  • Ashtabula, OH metro's Good-day share fell from 84.4% to 82.2% between the 2024 and 2025 EPA annual releases, a change of -2.1 percentage points.
  • Ashtabula, OH metro's peak single-day AQI rose from 108 to 122 between the 2024 and 2025 EPA annual releases, a change of +14 points.

Compared against 243 monitored days in 2024 and 242 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

Insights: Ashtabula, OH metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 43 over 245 measured days in 2025, which corresponds to a Good band and a Good metro-wide health grade. The monitored-day split lands at 199 Good days (81%), 43 Moderate (18%), and 3 Unhealthy-for-Sensitive-Groups (1%). The 90th-percentile AQI finished at 61 while the highest single-day reading hit 122 (USG). Metro residents averaged roughly 24.4 clean-air days per 30-day window across the reporting year.

Across the 2020–2025 trend window, the share of monitored days rated Good shifted by -10.7 points and the median AQI moved +6 points, which classifies the multi-year trajectory as worsening. The metro recorded no Unhealthy-tier days in this annual dataset. Metros with comparable AQI profiles include Bloomington, IN (67.7% good, AQI 43); Champaign-Urbana, IL (65.8% good, AQI 43); Cleveland, MS (71.9% good, AQI 43).

Air Quality Summary

Median AQI

43

Good

Good Days

81.2%

199 of 245 days

Max AQI

122

USG

Health Grade

Good

90th pct: 61

AQI Day Breakdown (2025)

Distribution of 245 monitored days across EPA AQI categories.

Good

199

81%

Moderate

43

18%

USG

3

1%

Unhealthy

0

0%

Very Unhealthy

0

0%

Hazardous

0

0%

Health Impact Assessment

Good

The Ashtabula, OH metro area's air quality is rated Good based on 81.2% 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 Ashtabula, OH metro compare?

How Ashtabula, OH compares

Good-day share better than typical
Ashtabula, OH 81.2%
Bloomington, IN 67.7%
Typical US metro 70.6%
Median AQI worse than typical
Ashtabula, OH 43
Bloomington, IN 43
Typical US metro 41
Unhealthy days / yr better than typical
Ashtabula, OH 0
Bloomington, IN 0
Typical US metro 1

5-Year Air Quality Trend

Air quality is worsening in the Ashtabula, OH metro. Highest Good-day share: 2020 (92.9%, 224 of 241 monitored days).

Year Good Moderate Unhealthy Median AQI
2020 224 17 0 37
2021 213 28 0 38
2022 211 23 0 38
2023 208 35 0 42
2024 205 38 0 41
2025 199 43 0 43

Metros with a similar median AQI

CBSA peers nationwide whose annual median AQI sits near Ashtabula, OH (43).

Bloomington, IN

Median AQI 43 · 67.7% Good-day share

43

Champaign-Urbana, IL

Median AQI 43 · 65.8% Good-day share

43

Cleveland, MS

Median AQI 43 · 71.9% Good-day share

43

Columbus, IN

Median AQI 43 · 72.6% Good-day share

43

Durham-Chapel Hill, NC

Median AQI 43 · 71.5% Good-day share

43

Elizabethtown-Fort Knox, KY

Median AQI 43 · 73.4% Good-day share

43

Metros with similar unhealthy-day exposure

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

More Air Quality Data

Explore EPA air quality rankings and guides across U.S. metros and counties.

Cleanest Metro Areas

U.S. metros ranked by their share of Good air-quality days.

Worst Air Quality

Counties and metros with the most unhealthy air days.

All Metro Areas

Annual AQI by CBSA for every monitored U.S. metro area.

Best and Worst City Air

What drives urban air quality and how metro areas compare.

Air Quality Guides

Frequently Asked Questions

What is the air quality in the Ashtabula, OH metro area? ▼
The Ashtabula, OH metro area has a median Air Quality Index (AQI) of 43, rated "Good." 81.2% of monitored days (199 out of 245) had good air quality in 2025.
How many unhealthy air days does Ashtabula, OH have? ▼
In 2025, the Ashtabula, OH metro area recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 122.
Is air quality in Ashtabula, OH getting better or worse? ▼
Air quality in the Ashtabula, 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 92.9% (224 of 241 days). Lowest qualifying Good-day share: 2025 at 82.2% (199 of 242 days).
What does AQI 43 mean for health? ▼
An AQI of 43 is "Good", air quality is satisfactory and poses little or no health risk. This is the best category on the EPA's AQI scale.
What is the 90th percentile AQI for Ashtabula, OH? ▼
The 90th percentile AQI for the Ashtabula, OH metro area is 61, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 122 (USG).
How does Ashtabula, OH compare to other metro areas? ▼
The Ashtabula, OH metro has 81.2% good air days. Similar metros: Bloomington, IN (67.7% good), Champaign-Urbana, IL (65.8% good), Cleveland, MS (71.9% good).

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

Share this annual record

Send the source-year summary or download its ready-to-use data card.

XFacebookLinkedInWhatsAppEmail

Every figure on PlainAirData 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.