Kentucky · County air quality · 2025
Bell County, Kentucky
Median AQI 42 (Good). 67.0% of monitored days rated Good, direct from EPA Air Quality System stations.
- 42
- Median AQI
- 67.0%
- Good-air days
- 0
- Unhealthy days
- 26%
- Cleaner than US counties
Bell County's 2025 annual median AQI is 42 (Good), with 67.0% Good days
According to the U.S. EPA Air Quality System, Bell County, Kentucky posted a 2025 median AQI of 42 (Good) across 361 monitored days, with 67.0% 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
- Bell County's 67.0% Good-day share places it cleaner than 26% of US counties in 2025.
- Closest median-AQI peer
- Ada County (74.0% Good, median AQI 42) is the closest nationwide median-AQI peer to Bell County.
- 2020–2025 trend
- Bell County's floor-qualifying Good-day share is worsening from 2020 to 2025 (92.0% → 67.0%).
- Median AQI
- Median AQI: 42
According to the 2025 EPA AQS county release on PlainAirData, Bell County, Kentucky ranks #581 of 951 by median AQI (42) and #703 by good-day share (67.0%). Ponce County, Puerto Rico is #1 of 951 by median AQI (3, 91.4% Good days) at good-day-share #159 ≠ largest of 7 at 100.0% Good days #1 by good-day share (100.0%, median AQI 9) at median-AQI #7.
Annual release change
What changed in the 2025 EPA annual release
- Bell County's peak single-day AQI rose from 88 to 101 between the 2024 and 2025 EPA annual releases, a change of +13 points.
Data updated August 2026
- Good · 242 d · 67.0%
- Moderate · 118 d · 32.7%
- USG · 1 d · 0.3%
How did Bell County's air break down in 2025?
Across 361 monitored days, 242 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 101 (USG).
EPA AQS →Share of monitored days at AQI 0-50 (Good band).
Share of monitored days above AQI 150 (Unhealthy or worse). Bar maxes at 10% (worst-county ceiling).
Where Bell County sits nationally
COUNT-derived placement among 951 US counties with at least 100 monitored days in 2025. Bell County's Good-day share is 67.0% - cleaner than 26% of that comparison set.
Bell County Good-day share vs. every US county
Share of monitored days in the Good band (AQI 0–50) - EPA AQS annual release
67.0% 26th percentile higher than 26% of 951 US counties
Each bar is a band; taller bars hold more US counties. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source U.S. Environmental Protection Agency, Air Quality System (AQS) · 2025
Pollutant Breakdown
Days where each pollutant was the primary driver of AQI readings in Bell County.
- PM2.5 · 258 days · 71.5%
- Ozone · 103 days · 28.5%
2024 daily-monitor rhythm in Bell County
Month-by-month median AQI from EPA day-level county monitors (365 reported days in 2024). Feb posted the highest typical readings (median AQI 55, peak 88); Nov was cleanest at median 33. Summer months (Jun–Aug) averaged median AQI 47 vs 45 in Dec–Feb.
Five-year seasonal record
EPA day-level county files · 2020–20241,722 daily readings show a recurring local pattern: Jun has the highest matched-month median AQI (51), while Sep is lowest (40). Each cell is that month’s median daily AQI, not a current-air forecast.
Lower AQI is better. The colors summarize EPA AQI bands; gaps mean the county had no day-level record for that month.
Health Impact Assessment
Bell County's air quality is rated Moderate based on 67.0% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 67.0% of monitored days in 2025, with a median AQI of 42. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is PM2.5, driving AQI on 258 of 361 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Bell County. Highest Good-day share: 2020 (92.0%, 242 of 263 monitored days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 242 | 21 | 0 | 0 | 34 | 74 |
| 2021 | 164 | 198 | 2 | 0 | 52 | 112 |
| 2022 | 197 | 168 | 0 | 0 | 48 | 91 |
| 2023 | 185 | 177 | 3 | 0 | 49 | 131 |
| 2024 | 244 | 121 | 0 | 0 | 44 | 88 |
| 2025 | 242 | 118 | 1 | 0 | 42 | 101 |
How does Bell County compare?
How Bell County compares
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 Bell County, Kentucky · 2020–2025
Download this county's annual AQI row as CSV , with the same EPA fields and denominator shown on this page.
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.