Metro area air quality · 2025
Jefferson City, MO
Median AQI 41 (Good). 89.6% of monitored days rated Good across this metro's EPA monitoring network.
- 41
- Median AQI
- 89.6%
- Good-air days
- 0
- Unhealthy days
- 85%
- Cleaner than US metros
Jefferson City, MO posted a 2025 median AQI of 41 (Good) with 89.6% Good days
According to the U.S. EPA Air Quality System, the Jefferson City, MO CBSA recorded a median AQI of 41 across 260 monitored days in 2025, with 89.6% 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 Jefferson City, MO CBSA's 89.6% Good-day share places it cleaner than 85% of US metros in 2025.
- Closest median-AQI peer
- Adrian, MI (69.3% Good, median AQI 41) is the closest nationwide median-AQI peer to Jefferson City, MO.
- 2020–2025 Good-day shift
- Jefferson City, MO's Good-day share moved -5.9 points from 2020 to 2025 (median AQI +6).
- Median AQI
- Median AQI: 41
Aggregated from EPA Air Quality System (2025), 260 monitored days. EPA AQS →
The verdict
Jefferson City, MO sits in the upper Good-day tercile among EPA CBSA metros on this site (89.6% of 260 monitored days). On the EPA scale the metro runs good, cleaner than most US metros, with a median AQI of 41 and 89.6% of 260 monitored days in the Good band.
- 41
- median AQI · Good
- 89.6%
- days rated Good
- 85%
- cleaner than US metros
- 77
- 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
- Jefferson City, MO metro's Good-day share fell from 95.0% to 89.6% between the 2024 and 2025 EPA annual releases, a change of -5.4 percentage points.
Jefferson City, MO sits in the upper Good-day tercile among EPA CBSA metros on this site (89.6% of 260 monitored days). Signature read: 89.6% Good-day share (high tercile vs CBSA corpus). Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 41 over 260 measured days in 2025 (Good / Good). The monitored-day split lands at 233 Good (90%), 27 Moderate (10%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 51; the highest single-day reading hit 77 (Moderate).
Across 2020–2025, Good-day share shifted -5.9 points and median AQI moved +6 (worsening). No Unhealthy-tier days appear in this annual dataset. Metros with comparable AQI profiles include Adrian, MI (69.3% good, AQI 41); Albany-Schenectady-Troy, NY (67.7% good, AQI 41); Ann Arbor, MI (69.3% good, AQI 41).
Air Quality Summary
Median AQI
41
Good
Good Days
89.6%
233 of 260 days
Max AQI
77
Moderate
Health Grade
Good
90th pct: 51
AQI Day Breakdown (2025)
Distribution of 260 monitored days across EPA AQI categories.
Good
233
90%
Moderate
27
10%
USG
0
0%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Health Impact Assessment
The Jefferson City, MO metro area's air quality is rated Good based on 89.6% 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 Jefferson City, MO metro compare?
How Jefferson City, MO compares
5-Year Air Quality Trend
Air quality is worsening in the Jefferson City, MO metro. Highest Good-day share: 2020 (95.5%, 234 of 245 monitored days).
| Year | Good | Moderate | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|
| 2020 | 234 | 11 | 0 | 35 | 87 |
| 2021 | 229 | 16 | 0 | 39 | 80 |
| 2022 | 222 | 22 | 0 | 40 | 74 |
| 2023 | 197 | 43 | 0 | 43 | 133 |
| 2024 | 249 | 13 | 0 | 40 | 77 |
| 2025 | 233 | 27 | 0 | 41 | 77 |
Metros with a similar median AQI
CBSA peers nationwide whose annual median AQI sits near Jefferson City, MO (41).
Adrian, MI
Median AQI 41 · 69.3% Good-day share
Albany-Schenectady-Troy, NY
Median AQI 41 · 67.7% Good-day share
Ann Arbor, MI
Median AQI 41 · 69.3% Good-day share
Bowling Green, KY
Median AQI 41 · 75.6% Good-day share
Brunswick, GA
Median AQI 41 · 74.3% Good-day share
Decatur, AL
Median AQI 41 · 78.4% Good-day share
Metros with similar unhealthy-day exposure
A second relationship type: metros whose unhealthy-or-worse day count is closest to Jefferson City, MO'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
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
Alexandria, LA
0 unhealthy-or-worse days · median AQI 37
Frequently Asked Questions
How many unhealthy air days does Jefferson City, MO have? ▼
What is the air quality in the Jefferson City, MO metro area? ▼
Is air quality in Jefferson City, MO getting better or worse? ▼
What does AQI 41 mean for health? ▼
How does Jefferson City, MO compare to other metro areas? ▼
What is the 90th percentile AQI for Jefferson City, MO? ▼
Data Sources
Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset for Jefferson City, MO, 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, Jefferson City, MO · 2020–2025