Median AQI
43
Good
Iowa · County air quality · 2025
Muscatine County, Iowa
Median AQI 43 (Good). 66.0% of monitored days rated Good, direct from EPA Air Quality System stations.
- 43
- Median AQI
- 66.0%
- Good-air days
- 0
- Unhealthy days
- 25%
- Cleaner than US counties
Muscatine County's 2025 annual median AQI is 43 (Good), with 66.0% Good days
According to the U.S. EPA Air Quality System, Muscatine County, Iowa posted a 2025 median AQI of 43 (Good) across 365 monitored days, with 66.0% rated Good and 0 unhealthy or worse. This is an annual comparison, not today's advisory.
Data source EPA Air Quality System (AQS)
- Cleaner than US
- Muscatine County's 66.0% Good-day share places it cleaner than 25% of US counties in 2025.
- Closest median-AQI peer
- Ashtabula County (81.2% Good, median AQI 43) is the closest nationwide median-AQI peer to Muscatine County.
- 2020–2025 trend
- Muscatine County's floor-qualifying Good-day share is stable from 2020 to 2025 (66.9% → 66.0%).
- Median AQI
- Median AQI: 43
The verdict
According to EPA Air Quality System monitoring data, Muscatine County's air is good on balance, more polluted than the median US county, a median AQI of 43 with 66.0% of 365 monitored days in the Good band, driven mainly by PM2.5.
- 43
- median AQI · Good
- 66.0%
- days rated Good
- PM2.5
- main pollutant
- 25%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 141.
Annual release change
What changed in the 2025 EPA annual release
- Muscatine County's Good-day share fell from 73.5% to 66.0% between the 2024 and 2025 EPA annual releases, a change of -7.5 percentage points.
- Muscatine County's peak single-day AQI rose from 78 to 141 between the 2024 and 2025 EPA annual releases, a change of +63 points.
- Muscatine County's median AQI rose from 38 to 43 between the 2024 and 2025 EPA annual releases, a change of +5 points.
Data updated August 2026
- Good · 241 d · 66.0%
- Moderate · 122 d · 33.4%
- USG · 2 d · 0.5%
How did Muscatine County's air break down in 2025?
Across 365 monitored days, 241 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 141 (USG).
EPA AQS →Air quality data from EPA Air Quality System (2025). 365 days monitored. Median AQI: 43 (Good).
Insights: Muscatine County, Iowa. EPA monitors recorded a median Air Quality Index of 43 across 365 measured days in 2025, earning a Good classification and a Moderate health grade. Of those days, 241 (66%) fell in the Good band (AQI 0–50), 122 (33%) registered Moderate readings, and 2 (1%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 59, while the worst single-day peak hit 141 (USG). Residents averaged about 19.8 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as PM2.5 (365 days). Across the 2020–2025 trend window, the share of monitored days rated Good shifted by -0.9 points and the median AQI moved +3 points, placing the multi-year trajectory at stable. The worst single reading over the 2020–2025 window was AQI 141, usg but never Unhealthy. Nearby counties show comparable readings: Black Hawk (53.4% good, AQI 49); Bremer (87.1% good, AQI 38); Clinton (59.5% good, AQI 45); Harrison (83.0% good, AQI 39); Johnson (70.1% good, AQI 37); Linn (61.4% good, AQI 44).
Air Quality Summary
Good Days
66.0%
241 of 365 monitored days
-9.0pp vs 75% target
Max AQI Recorded
141
USG
Health Grade
Moderate
90th-pct AQI 59
Muscatine County, Good days share 66.0%
National avg
Share of monitored days at AQI 0-50 (Good band).
Muscatine County, Unhealthy-or-worse share 0.0%
National avg
Share of monitored days above AQI 150 (Unhealthy or worse). Bar maxes at 10% (worst-county ceiling).
AQI Day Breakdown (2025)
Distribution of 365 monitored days across EPA AQI categories.
Good
241
66%
Moderate
122
33%
USG
2
1%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Pollutant Breakdown
Days where each pollutant was the primary driver of AQI readings in Muscatine County.
- PM2.5 · 365 days · 100.0%
Health Impact Assessment
Moderate
Muscatine County's air quality is rated Moderate based on 66.0% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 66.0% of monitored days in 2025, with a median AQI of 43. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is PM2.5, driving AQI on 365 of 365 monitored days.
5-Year Air Quality Trend
Air quality is stable in Muscatine County. Highest Good-day share: 2024 (73.5%, 269 of 366 monitored days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 245 | 120 | 1 | 0 | 40 | 124 |
| 2021 | 211 | 154 | 0 | 0 | 45 | 90 |
| 2022 | 235 | 130 | 0 | 0 | 42 | 89 |
| 2023 | 188 | 173 | 1 | 2 | 49 | 207 |
| 2024 | 269 | 97 | 0 | 0 | 38 | 78 |
| 2025 | 241 | 122 | 2 | 0 | 43 | 141 |
How does Muscatine County compare?
How Muscatine County compares
Good-day share worse than typical
Muscatine County 66.0%
Ashtabula County, Ohio 81.2%
Typical US county 76.0%
Median AQI worse than typical
Muscatine County 43
Ashtabula County, Ohio 43
Typical US county 39
Unhealthy days / yr better than typical
Muscatine County 0
Ashtabula County, Ohio 0
Typical US county 1
Counties with a similar median AQI
Nationwide peers within about the same annual median AQI as Muscatine County (43), not geographic neighbors.
Ashtabula County, Ohio
Median AQI 43 · 81.2% Good-day share
Baltimore (City) County, Maryland
Median AQI 43 · 68.1% Good-day share
Bartholomew County, Indiana
Median AQI 43 · 72.6% Good-day share
Berks County, Pennsylvania
Median AQI 43 · 68.2% Good-day share
Bolivar County, Mississippi
Median AQI 43 · 71.9% Good-day share
Brewster County, Texas
Median AQI 43 · 74.7% Good-day share
Same primary pollutant: PM2.5
PM2.5 led the AQI on the most monitored days here. These peers share that driver and the closest Good-day share (a second relationship type beyond median-AQI neighbors).
Kaufman County, Texas
66.0% Good-day share · median AQI 44
McLean County, Illinois
66.0% Good-day share · median AQI 44
Jackson County, Oregon
66.3% Good-day share · median AQI 43
Waukesha County, Wisconsin
66.3% Good-day share · median AQI 41
Floyd County, Indiana
65.8% Good-day share · median AQI 44
Lafayette County, Louisiana
65.8% Good-day share · median AQI 45
Iowa counties on the map
Geographic containment only, other monitored counties in Iowa, independent of AQI or pollutant match.
What Muscatine County's air means for you
The air here stays in the breathable range year-round, with PM2.5 the main thing to watch.
- Sensitive groups (asthma, heart conditions, children, older adults) should check the AQI on high-PM2.5 days, the guide explains what a median of 43 means for exposure. Health guidance
- See how Muscatine County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Muscatine County with its Iowa neighbours before drawing a conclusion about the region. All of Iowa
Based on 365 EPA-monitored days in 2025; figures reflect only days the monitors reported. Source: EPA Air Quality System annual summaries.
Keep exploring the annual AQI record
Air-quality reading list
Frequently Asked Questions
What is the air quality in Muscatine County, Iowa? ▼
Muscatine County has a median Air Quality Index (AQI) of 43, rated "Good." 66.0% of monitored days (241 out of 365) had good air quality in 2025.
What is the main pollutant in Muscatine County? ▼
The primary pollutant in Muscatine County is Fine Particles (PM2.5), which was the main AQI driver on 365 days (100% of monitored days). Penetrates deep into lungs and bloodstream. Linked to heart disease and premature death.
How many unhealthy air days does Muscatine County have? ▼
In 2025, Muscatine County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 141.
Is the air quality in Muscatine County getting better or worse? ▼
Air quality in Muscatine County 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 73.5% (269 of 366 days). Lowest qualifying Good-day share: 2023 at 51.6% (188 of 365 days).
What does AQI 43 mean for health? ▼
Muscatine County's median AQI of 43 falls in the "Good" category. See the AQI category guide for what each range means for health.
How does Muscatine County compare to other counties in Iowa? ▼
Muscatine County has 66.0% good air days. Nearby counties in Iowa: Black Hawk (53.4% good), Bremer (87.1% good), Clinton (59.5% good), Harrison (83.0% good), Johnson (70.1% good), Linn (61.4% good).
What is the 90th percentile AQI in Muscatine County? ▼
The 90th percentile AQI for Muscatine County is 59, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 141 (USG).
Data Sources
Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by County dataset, 2020–2025 (aqs.epa.gov). For current conditions (not shown here — this page is historical annual data), see EPA AirNow (airnow.gov). See our methodology for how AQI, median, and coverage figures are computed.
Informational only, not professional advice. Data from EPA AQS. See our disclaimer. Spotted a figure that looks wrong? Report a correction.
Source: U.S. EPA Air Quality System (AQS) Annual AQI by county summary files for Muscatine County, Iowa · 2020–2025
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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.