Median AQI
39
Good
Kentucky · County air quality · 2025
Campbell County, Kentucky
Median AQI 39 (Good). 75.6% of monitored days rated Good, direct from EPA Air Quality System stations.
- 39
- Median AQI
- 75.6%
- Good-air days
- 0
- Unhealthy days
- 45%
- Cleaner than US counties
Campbell County's 2025 annual median AQI is 39 (Good), with 75.6% Good days
According to the U.S. EPA Air Quality System, Campbell County, Kentucky posted a 2025 median AQI of 39 (Good) across 365 monitored days, with 75.6% 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
- Campbell County's 75.6% Good-day share places it cleaner than 45% of US counties in 2025.
- Closest median-AQI peer
- Aiken County (90.6% Good, median AQI 39) is the closest nationwide median-AQI peer to Campbell County.
- 2020–2025 trend
- Campbell County's floor-qualifying Good-day share is improving from 2020 to 2025 (67.2% → 75.6%).
- Median AQI
- Median AQI: 39
The verdict
According to EPA Air Quality System monitoring data, Campbell County's air is good on balance, more polluted than the median US county, a median AQI of 39 with 75.6% of 365 monitored days in the Good band, driven mainly by PM2.5.
- 39
- median AQI · Good
- 75.6%
- days rated Good
- PM2.5
- main pollutant
- 45%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 122.
Annual release change
What changed in the 2025 EPA annual release
- Campbell County's Good-day share fell from 77.9% to 75.6% between the 2024 and 2025 EPA annual releases, a change of -2.3 percentage points.
- Campbell County's peak single-day AQI rose from 108 to 122 between the 2024 and 2025 EPA annual releases, a change of +14 points.
Data updated August 2026
- Good · 276 d · 75.6%
- Moderate · 85 d · 23.3%
- USG · 4 d · 1.1%
How did Campbell County's air break down in 2025?
Across 365 monitored days, 276 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 122 (USG).
EPA AQS →Air quality data from EPA Air Quality System (2025). 365 days monitored. Median AQI: 39 (Good).
Insights: Campbell County, Kentucky. EPA monitors recorded a median Air Quality Index of 39 across 365 measured days in 2025, earning a Good classification and a Good health grade. Of those days, 276 (76%) fell in the Good band (AQI 0–50), 85 (23%) registered Moderate readings, and 4 (1%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 57, while the worst single-day peak hit 122 (USG). Residents averaged about 22.7 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as PM2.5 (198 days), Ozone (165 days), NO2 (2 days). Across the 2020–2025 trend window, the share of monitored days rated Good shifted by +8.4 points and the median AQI moved -4 points, placing the multi-year trajectory at improving. The worst single reading over the 2020–2025 window was AQI 122, usg but never Unhealthy. Nearby counties show comparable readings: Bell (67.0% good, AQI 42); Boone (87.6% good, AQI 38); Boyd (80.0% good, AQI 39); Bullitt (88.4% good, AQI 39); Carter (89.0% good, AQI 36); Christian (73.1% good, AQI 41).
Air Quality Summary
Good Days
75.6%
276 of 365 monitored days
0.6pp vs 75% target
Max AQI Recorded
122
USG
Health Grade
Good
90th-pct AQI 57
Campbell County, Good days share 75.6%
National avg
Share of monitored days at AQI 0-50 (Good band).
Campbell 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
276
76%
Moderate
85
23%
USG
4
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 Campbell County.
- PM2.5 · 198 days · 54.2%
- Ozone · 165 days · 45.2%
- NO₂ · 2 days · 0.5%
Health Impact Assessment
Good
Campbell County's air quality is rated Good based on 75.6% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 75.6% of monitored days in 2025, with a median AQI of 39. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is PM2.5, driving AQI on 198 of 365 monitored days.
5-Year Air Quality Trend
Air quality is improving in Campbell County. Highest Good-day share: 2024 (77.9%, 285 of 366 monitored days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 246 | 120 | 0 | 0 | 43 | 93 |
| 2021 | 230 | 131 | 1 | 0 | 44 | 101 |
| 2022 | 246 | 115 | 1 | 0 | 43 | 105 |
| 2023 | 234 | 120 | 4 | 2 | 44 | 187 |
| 2024 | 285 | 78 | 3 | 0 | 40 | 108 |
| 2025 | 276 | 85 | 4 | 0 | 39 | 122 |
How does Campbell County compare?
How Campbell County compares
Good-day share about average
Campbell County 75.6%
Aiken County, South Carolina 90.6%
US average 76.0%
Median AQI about average
Campbell County 39
Aiken County, South Carolina 39
US average 39
Unhealthy days / yr better than US avg
Campbell County 0
Aiken County, South Carolina 0
US average 1
Counties with a similar median AQI
Nationwide peers within about the same annual median AQI as Campbell County (39), not geographic neighbors.
Aiken County, South Carolina
Median AQI 39 · 90.6% Good-day share
Albany County, New York
Median AQI 39 · 68.5% Good-day share
Anderson County, Tennessee
Median AQI 39 · 94.3% Good-day share
Bay County, Michigan
Median AQI 39 · 70.4% Good-day share
Berkeley County, West Virginia
Median AQI 39 · 83.6% Good-day share
Boyd County, Kentucky
Median AQI 39 · 80.0% 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).
Henry County, Georgia
75.6% Good-day share · median AQI 39
Sauk County, Wisconsin
75.6% Good-day share · median AQI 35
Wakulla County, Florida
75.6% Good-day share · median AQI 41
Stearns County, Minnesota
75.6% Good-day share · median AQI 37
Baldwin County, Alabama
75.5% Good-day share · median AQI 42
Gage County, Nebraska
75.8% Good-day share · median AQI 34
Kentucky counties on the map
Geographic containment only, other monitored counties in Kentucky, independent of AQI or pollutant match.
What Campbell 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 39 means for exposure. Health guidance
- See how Campbell County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Campbell County with its Kentucky neighbours before drawing a conclusion about the region. All of Kentucky
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 Campbell County, Kentucky? ▼
Campbell County has a median Air Quality Index (AQI) of 39, rated "Good." 75.6% of monitored days (276 out of 365) had good air quality in 2025.
What is the main pollutant in Campbell County? ▼
The primary pollutant in Campbell County is Fine Particles (PM2.5), which was the main AQI driver on 198 days (54% of monitored days). Penetrates deep into lungs and bloodstream. Linked to heart disease and premature death.
How many unhealthy air days does Campbell County have? ▼
In 2025, Campbell County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 122.
Is the air quality in Campbell County getting better or worse? ▼
Air quality in Campbell County is improving 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 77.9% (285 of 366 days). Lowest qualifying Good-day share: 2021 at 63.5% (230 of 362 days).
What does AQI 39 mean for health? ▼
Campbell County's median AQI of 39 falls in the "Good" category. See the AQI category guide for what each range means for health.
How does Campbell County compare to other counties in Kentucky? ▼
Campbell County has 75.6% good air days. Nearby counties in Kentucky: Bell (67.0% good), Boone (87.6% good), Boyd (80.0% good), Bullitt (88.4% good), Carter (89.0% good), Christian (73.1% good).
What is the 90th percentile AQI in Campbell County? ▼
The 90th percentile AQI for Campbell County is 57, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 122 (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 Campbell County, Kentucky · 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.