Metro area air quality · 2025

Clinton, IA

Median AQI 45 (Good). 59.9% of monitored days rated Good across this metro's EPA monitoring network.

45
Median AQI
59.9%
Good-air days
1
Unhealthy days
23%
Cleaner than US metros

Aggregated from EPA Air Quality System (2025), 304 monitored days. EPA AQS →

The verdict

The Clinton, IA metro runs good on the EPA scale, among the more polluted US metros, a median AQI of 45 with 59.9% of 304 monitored days in the Good band.

45
median AQI · Good
59.9%
days rated Good
23%
cleaner than US metros
166
worst single reading

1 day reached Unhealthy or worse across the metro's monitors in 2025.

Insights: Clinton, IA metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 45 over 304 measured days in 2025, which corresponds to a Good band and a Moderate metro-wide health grade. The monitored-day split lands at 182 Good days (60%), 119 Moderate (39%), and 2 Unhealthy-for-Sensitive-Groups (1%). The 90th-percentile AQI finished at 71 while the highest single-day reading hit 166 (Unhealthy). Metro residents averaged roughly 18.0 clean-air days per 30-day window across the reporting year.

Across the 2020–2025 trend window, good days shifted by -17 and the median AQI moved +0 points, which classifies the multi-year trajectory as stable. The metro recorded 1 unhealthy-or-worse days combined, on those days the EPA recommends that sensitive groups limit prolonged outdoor exertion, and many schools and athletic programs adjust outdoor activity accordingly. Metros with comparable AQI profiles include Akron, OH (62.2% good, AQI 45); Carson City, NV (79.3% good, AQI 45); Davenport-Moline-Rock Island, IA-IL (58.4% good, AQI 45).

Air Quality Summary

Median AQI

45

Good

Good Days

59.9%

182 of 304 days

Max AQI

166

Unhealthy

Health Grade

Moderate

90th pct: 71

AQI Day Breakdown (2025)

Distribution of 304 monitored days across EPA AQI categories.

Good

182

60%

Moderate

119

39%

USG

2

1%

Unhealthy

1

0%

Very Unhealthy

0

0%

Hazardous

0

0%

Health Impact Assessment

Moderate

The Clinton, IA metro area's air quality is rated Moderate based on 59.9% good air days. There were 1 unhealthy days in 2025 when outdoor activity should be limited.

Air quality is acceptable most days, but 2 days reached "Unhealthy for Sensitive Groups" and peak AQI reached 166. Sensitive groups should monitor real-time conditions at AirNow.gov.

How does the Clinton, IA metro compare?

How Clinton, IA compares

Good-day share worse than US avg
Clinton, IA 59.9%
Akron, OH 62.2%
US average 71.3%
Median AQI worse than US avg
Clinton, IA 45
Akron, OH 45
US average 41
Unhealthy days / yr about average
Clinton, IA 1
Akron, OH 0
US average 1

5-Year Air Quality Trend

Air quality is stable in the Clinton, IA metro. Best year: 2024 (230 good days).

Year Good Moderate Unhealthy Median AQI
2020 199 125 0 45
2021 134 229 0 55
2022 165 198 0 52
2023 132 215 3 54
2024 230 135 0 46
2025 182 119 1 45

Metros with Similar Air Quality

Metro areas across the US with a similar median AQI to Clinton, IA.

Akron, OH

AQI 45 · 62.2% good

45

Carson City, NV

AQI 45 · 79.3% good

45

Davenport-Moline-Rock Island, IA-IL

AQI 45 · 58.4% good

45

Española, NM

AQI 45 · 79.9% good

45

Gadsden, AL

AQI 45 · 63.5% good

45

Helena, MT

AQI 45 · 65.4% good

45

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 Clinton, IA metro area? ▼
The Clinton, IA metro area has a median Air Quality Index (AQI) of 45, rated "Good." 59.9% of monitored days (182 out of 304) had good air quality in 2025.
How many unhealthy air days does Clinton, IA have? ▼
In 2025, the Clinton, IA metro area recorded 1 unhealthy air days (1 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 166.
Is air quality in Clinton, IA getting better or worse? ▼
Air quality in the Clinton, IA metro is stable based on 5-year trends (2020-2025). Best year: 2024 with 230 good days. Worst year: 2023 with 132 good days.
What does AQI 45 mean for health? ▼
An AQI of 45 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 Clinton, IA? ▼
The 90th percentile AQI for the Clinton, IA metro area is 71, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 166 (Unhealthy).
How does Clinton, IA compare to other metro areas? ▼
The Clinton, IA metro has 59.9% good air days. Similar metros: Akron, OH (62.2% good), Carson City, NV (79.3% good), Davenport-Moline-Rock Island, IA-IL (58.4% 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

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.