Metro area air quality · 2025

Clinton, IA

Median AQI 45 (Good). 59.5% of monitored days rated Good across this metro's EPA monitoring network.

45
Median AQI
59.5%
Good-air days
1
Unhealthy days
24%
Cleaner than US metros

Clinton, IA posted a 2025 median AQI of 45 (Good) with 59.5% Good days

According to the U.S. EPA Air Quality System, the Clinton, IA CBSA recorded a median AQI of 45 across 365 monitored days in 2025, with 59.5% rated Good and 1 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 Clinton, IA CBSA's 59.5% Good-day share places it cleaner than 24% of US metros in 2025.
Closest median-AQI peer
Akron, OH (61.6% Good, median AQI 45) is the closest nationwide median-AQI peer to Clinton, IA.
2020–2025 Good-day shift
Clinton, IA's Good-day share moved -1.6 points from 2020 to 2025 (median AQI +0).
Median AQI
Median AQI: 45

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

The verdict

Clinton, IA lands in the lower Good-day tercile (59.5% 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 45 and 59.5% of 365 monitored days in the Good band.

45
median AQI · Good
59.5%
days rated Good
24%
cleaner than US metros
166
worst single reading

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

Annual release change

What changed in the 2025 EPA annual release

2024 → 2025
  • Clinton, IA metro's peak single-day AQI rose from 90 to 166 between the 2024 and 2025 EPA annual releases, a change of +76 points.
  • Clinton, IA metro's Good-day share fell from 63.0% to 59.8% between the 2024 and 2025 EPA annual releases, a change of -3.2 percentage points.
  • Clinton, IA metro's Unhealthy-category days rose from 0 to 1 between the 2024 and 2025 EPA annual releases, a change of +1 days.

Compared against 365 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

Clinton, IA lands in the lower Good-day tercile (59.5% Good), a thinner clean-air share than most CBSA peers here. Signature read: 59.5% 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 45 over 365 measured days in 2025 (Good / Moderate). The monitored-day split lands at 217 Good (59%), 145 Moderate (40%), and 2 Unhealthy-for-Sensitive-Groups (1%). The 90th-percentile AQI finished at 71; the highest single-day reading hit 166 (Unhealthy).

Across 2020–2025, Good-day share shifted -1.6 points and median AQI moved +0 (stable). The annual record contains 1 day at Unhealthy or worse. Metros with comparable AQI profiles include Akron, OH (61.6% good, AQI 45); Ardmore, OK (67.9% good, AQI 45); Asheville, NC (69.9% good, AQI 45).

Health effects of air pollution →

Air Quality Summary

Median AQI

45

Good

Good Days

59.5%

217 of 365 days

Max AQI

166

Unhealthy

Health Grade

Moderate

90th pct: 71

AQI Day Breakdown (2025)

Distribution of 365 monitored days across EPA AQI categories.

Good

217

59%

Moderate

145

40%

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 59.5% 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 typical
Clinton, IA 59.5%
Akron, OH 61.6%
Typical US metro 70.6%
Median AQI worse than typical
Clinton, IA 45
Akron, OH 45
Typical US metro 41
Unhealthy days / yr about typical
Clinton, IA 1
Akron, OH 0
Typical US metro 1

5-Year Air Quality Trend

Air quality is stable in the Clinton, IA metro. Highest Good-day share: 2024 (63.0%, 230 of 365 monitored 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 217 145 1 45

Metros with a similar median AQI

CBSA peers nationwide whose annual median AQI sits near Clinton, IA (45).

Akron, OH

Median AQI 45 · 61.6% Good-day share

45

Ardmore, OK

Median AQI 45 · 67.9% Good-day share

45

Asheville, NC

Median AQI 45 · 69.9% Good-day share

45

Cheyenne, WY

Median AQI 45 · 75.1% Good-day share

45

Fort Dodge, IA

Median AQI 45 · 59.2% Good-day share

45

Gadsden, AL

Median AQI 45 · 61.4% Good-day share

45

Metros with similar unhealthy-day exposure

A second relationship type: metros whose unhealthy-or-worse day count is closest to Clinton, IA's 1 (independent of median AQI).

Ann Arbor, MI

1 unhealthy-or-worse days · median AQI 41

41

Bangor, ME

1 unhealthy-or-worse days · median AQI 33

33

Baraboo, WI

1 unhealthy-or-worse days · median AQI 35

35

Bartlesville, OK

1 unhealthy-or-worse days · median AQI 44

44

Beaumont-Port Arthur, TX

1 unhealthy-or-worse days · median AQI 52

52

Beaver Dam, WI

1 unhealthy-or-worse days · median AQI 40

40

Frequently Asked Questions

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.
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." 59.5% of monitored days (217 out of 365) had good air quality in 2025.
Is air quality in Clinton, IA getting better or worse? ▼
Air quality in the Clinton, IA metro is stable across floor-qualifying years (2020-2025); years with fewer than 100 monitored days are excluded from that direction. Highest qualifying Good-day share: 2024 at 63.0% (230 of 365 days). Lowest qualifying Good-day share: 2021 at 36.9% (134 of 363 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.
How does Clinton, IA compare to other metro areas? ▼
The Clinton, IA metro has 59.5% good air days. Similar metros: Akron, OH (61.6% good), Ardmore, OK (67.9% good), Asheville, NC (69.9% good).
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).

Data Sources

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