Metro area air quality · 2025
Elizabethtown-Fort Knox, KY
Median AQI 43 (Good). 73.4% of monitored days rated Good across this metro's EPA monitoring network.
- 43
- Median AQI
- 73.4%
- Good-air days
- 0
- Unhealthy days
- 52%
- Cleaner than US metros
Elizabethtown-Fort Knox, KY posted a 2025 median AQI of 43 (Good) with 73.4% Good days
According to the U.S. EPA Air Quality System, the Elizabethtown-Fort Knox, KY CBSA recorded a median AQI of 43 across 304 monitored days in 2025, with 73.4% rated Good and 0 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 Elizabethtown-Fort Knox, KY CBSA's 73.4% Good-day share places it cleaner than 52% of US metros in 2025.
- Closest median-AQI peer
- Ashtabula, OH (81.2% Good, median AQI 43) is the closest nationwide median-AQI peer to Elizabethtown-Fort Knox, KY.
- 2020–2025 Good-day shift
- Elizabethtown-Fort Knox, KY's Good-day share moved +0.1 points from 2020 to 2025 (median AQI +0).
- Median AQI
- Median AQI: 43
Aggregated from EPA Air Quality System (2025), 304 monitored days. EPA AQS →
The verdict
Elizabethtown-Fort Knox, KY's Good-day share (73.4%) sits in the middle CBSA tercile on this extract. On the EPA scale the metro runs good, cleaner than the median US metro, with a median AQI of 43 and 73.4% of 304 monitored days in the Good band.
- 43
- median AQI · Good
- 73.4%
- days rated Good
- 52%
- cleaner than US metros
- 97
- worst single reading
No day crossed into the Unhealthy tier across the metro's monitors in 2025.
Annual release change
What changed in the 2025 EPA annual release
- Elizabethtown-Fort Knox, KY metro's Good-day share fell from 83.8% to 73.4% between the 2024 and 2025 EPA annual releases, a change of -10.4 percentage points.
- Elizabethtown-Fort Knox, KY metro's peak single-day AQI rose from 67 to 97 between the 2024 and 2025 EPA annual releases, a change of +30 points.
Elizabethtown-Fort Knox, KY's Good-day share (73.4%) sits in the middle CBSA tercile on this extract. Signature read: 73.4% Good-day share (mid tercile vs CBSA corpus). Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 43 over 304 measured days in 2025 (Good / Moderate). The monitored-day split lands at 223 Good (73%), 81 Moderate (27%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 58; the highest single-day reading hit 97 (Moderate).
Across 2020–2025, Good-day share shifted +0.1 points and median AQI moved +0 (stable). No Unhealthy-tier days appear in this annual dataset. Metros with comparable AQI profiles include Ashtabula, OH (81.2% good, AQI 43); Bloomington, IN (67.7% good, AQI 43); Champaign-Urbana, IL (65.8% good, AQI 43).
Air Quality Summary
Median AQI
43
Good
Good Days
73.4%
223 of 304 days
Max AQI
97
Moderate
Health Grade
Moderate
90th pct: 58
AQI Day Breakdown (2025)
Distribution of 304 monitored days across EPA AQI categories.
Good
223
73%
Moderate
81
27%
USG
0
0%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Health Impact Assessment
The Elizabethtown-Fort Knox, KY metro area's air quality is rated Moderate based on 73.4% good air days. No unhealthy air days were recorded in 2025.
Air quality is generally acceptable. Unusually sensitive people should monitor real-time conditions at AirNow.gov during high-pollution events.
How does the Elizabethtown-Fort Knox, KY metro compare?
How Elizabethtown-Fort Knox, KY compares
5-Year Air Quality Trend
Air quality is stable in the Elizabethtown-Fort Knox, KY metro. Highest Good-day share: 2024 (83.8%, 129 of 154 monitored days).
| Year | Good | Moderate | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|
| 2020 | 268 | 98 | 0 | 43 | 80 |
| 2021 | 238 | 125 | 0 | 43 | 101 |
| 2022 | 242 | 120 | 0 | 44 | 86 |
| 2023 | 225 | 136 | 1 | 45 | 151 |
| 2024 | 129 | 25 | 0 | 41 | 67 |
| 2025 | 223 | 81 | 0 | 43 | 97 |
Metros with a similar median AQI
CBSA peers nationwide whose annual median AQI sits near Elizabethtown-Fort Knox, KY (43).
Ashtabula, OH
Median AQI 43 · 81.2% Good-day share
Bloomington, IN
Median AQI 43 · 67.7% Good-day share
Champaign-Urbana, IL
Median AQI 43 · 65.8% Good-day share
Cleveland, MS
Median AQI 43 · 71.9% Good-day share
Columbus, IN
Median AQI 43 · 72.6% Good-day share
Durham-Chapel Hill, NC
Median AQI 43 · 71.5% Good-day share
Metros with similar unhealthy-day exposure
A second relationship type: metros whose unhealthy-or-worse day count is closest to Elizabethtown-Fort Knox, KY's 0 (independent of median AQI).
Aberdeen, SD
0 unhealthy-or-worse days · median AQI 27
Aberdeen, WA
0 unhealthy-or-worse days · median AQI 22
Adrian, MI
0 unhealthy-or-worse days · median AQI 41
Akron, OH
0 unhealthy-or-worse days · median AQI 45
Albany, GA
0 unhealthy-or-worse days · median AQI 46
Albany, OR
0 unhealthy-or-worse days · median AQI 27
Frequently Asked Questions
How many unhealthy air days does Elizabethtown-Fort Knox, KY have? ▼
What is the air quality in the Elizabethtown-Fort Knox, KY metro area? ▼
Is air quality in Elizabethtown-Fort Knox, KY getting better or worse? ▼
What does AQI 43 mean for health? ▼
How does Elizabethtown-Fort Knox, KY compare to other metro areas? ▼
What is the 90th percentile AQI for Elizabethtown-Fort Knox, KY? ▼
Data Sources
Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset for Elizabethtown-Fort Knox, KY, 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, Elizabethtown-Fort Knox, KY · 2020–2025