Median AQI
39
Good
Kentucky · County air quality · 2025
Campbell County, Kentucky
Median AQI 39 (Good). 78.5% of monitored days rated Good, direct from EPA Air Quality System stations.
- 39
- Median AQI
- 78.5%
- Good-air days
- 0
- Unhealthy days
- 48%
- Cleaner than US counties
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 78.5% of 191 monitored days in the Good band, driven mainly by PM2.5.
- 39
- median AQI · Good
- 78.5%
- days rated Good
- PM2.5
- main pollutant
- 48%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 77.
Data updated July 2026
- Good · 150 d · 78.5%
- Moderate · 41 d · 21.5%
How did Campbell County's air break down in 2025?
Across 191 monitored days, 150 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 77 (Moderate).
EPA AQS →Air quality data from EPA Air Quality System (2025). 191 days monitored. Median AQI: 39 (Good).
Insights: Campbell County, Kentucky. EPA monitors recorded a median Air Quality Index of 39 across 191 measured days in 2025, earning a Good classification and a Good health grade. Of those days, 150 (79%) fell in the Good band (AQI 0–50), 41 (21%) registered Moderate readings, and 0 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 55, while the worst single-day peak hit 77 (Moderate). Residents averaged about 23.6 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as PM2.5 (109 days), Ozone (81 days), NO2 (1 days). Across the 2020–2025 trend window, good days shifted by -96 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 77, moderate but never Unhealthy. Nearby counties show comparable readings: Bell (63.5% good, AQI 43); Boone (95.1% good, AQI 38); Boyd (82.8% good, AQI 39); Bullitt (92.7% good, AQI 39); Carter (89.8% good, AQI 36); Christian (78.3% good, AQI 41).
Air Quality Summary
Good Days
78.5%
150 of 191 monitored days
3.5pp vs 75% target
Max AQI Recorded
77
Moderate
Health Grade
Good
90th-pct AQI 55
Campbell County, Good days share 78.5%
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 191 monitored days across EPA AQI categories.
Good
150
79%
Moderate
41
21%
USG
0
0%
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 · 109 days · 57.1%
- Ozone · 81 days · 42.4%
- NO₂ · 1 days · 0.5%
Health Impact Assessment
Good
Campbell County's air quality is rated Good based on 78.5% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 78.5% 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 109 of 191 monitored days.
5-Year Air Quality Trend
Air quality is improving in Campbell County. Best year: 2024 (285 good 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 | 150 | 41 | 0 | 0 | 39 | 77 |
How does Campbell County compare?
How Campbell County compares
Good-day share better than US avg
Campbell County 78.5%
Bell County, Kentucky 63.5%
US average 76.5%
Median AQI worse than US avg
Campbell County 39
Bell County, Kentucky 43
US average 38
Unhealthy days / yr about average
Campbell County 0
Bell County, Kentucky 0
US average 0
Other Counties in Kentucky
Air quality comparison for nearby counties in Kentucky.
Counties with Similar Air Quality
Counties across the US with a similar median AQI to Campbell County.
Ada County, Idaho
AQI 39 · 80.6% good
Aiken County, South Carolina
AQI 39 · 89.1% good
Albany County, New York
AQI 39 · 67.4% good
Alexander County, North Carolina
AQI 39 · 92.4% good
Ashland County, Wisconsin
AQI 39 · 85.6% good
Bennington County, Vermont
AQI 39 · 82.9% good
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 191 EPA-monitored days in 2025; figures reflect only days the monitors reported. Source: EPA Air Quality System annual summaries.
More Air Quality Data
Air Quality Guides
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." 78.5% of monitored days (150 out of 191) 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 109 days (57% 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 77.
Is the air quality in Campbell County getting better or worse? ▼
Air quality in Campbell County is improving based on 5-year trends (2020-2025). Best year: 2024 with 285 good days. Worst year: 2025 with 150 good days.
What does AQI 39 mean for health? ▼
Campbell County's median AQI of 39 falls in the "Good" category. See the <a href="/guides/understanding-aqi" class="underline">AQI category guide</a> for what each range means for health.
How does Campbell County compare to other counties in Kentucky? ▼
Campbell County has 78.5% good air days. Nearby counties in Kentucky: Bell (63.5% good), Boone (95.1% good), Boyd (82.8% good), Bullitt (92.7% good), Carter (89.8% good), Christian (78.3% good).
What is the 90th percentile AQI in Campbell County? ▼
The 90th percentile AQI for Campbell County is 55, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 77 (Moderate).
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.
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.