Metro area air quality · 2025
Meridian, MS
Median AQI 35 (Good). 94.6% of monitored days rated Good across this metro's EPA monitoring network.
- 35
- Median AQI
- 94.6%
- Good-air days
- 0
- Unhealthy days
- 94%
- Cleaner than US metros
Meridian, MS posted a 2025 median AQI of 35 (Good) with 94.6% Good days
According to the U.S. EPA Air Quality System, the Meridian, MS CBSA recorded a median AQI of 35 across 241 monitored days in 2025, with 94.6% 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 Meridian, MS CBSA's 94.6% Good-day share places it cleaner than 94% of US metros in 2025.
- Closest median-AQI peer
- Baraboo, WI (75.6% Good, median AQI 35) is the closest nationwide median-AQI peer to Meridian, MS.
- 2020–2025 Good-day shift
- Meridian, MS's Good-day share moved -5.4 points from 2020 to 2025 (median AQI +4).
- Median AQI
- Median AQI: 35
Aggregated from EPA Air Quality System (2025), 241 monitored days. EPA AQS →
The verdict
Meridian, MS sits in the upper Good-day tercile among EPA CBSA metros on this site (94.6% of 241 monitored days). On the EPA scale the metro runs good, among the cleanest 10% of US metros, with a median AQI of 35 and 94.6% of 241 monitored days in the Good band.
- 35
- median AQI · Good
- 94.6%
- days rated Good
- 94%
- cleaner than US metros
- 93
- 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
- Meridian, MS metro's Good-day share fell from 99.6% to 94.6% between the 2024 and 2025 EPA annual releases, a change of -5.0 percentage points.
- Meridian, MS metro's peak single-day AQI rose from 51 to 93 between the 2024 and 2025 EPA annual releases, a change of +42 points.
Meridian, MS sits in the upper Good-day tercile among EPA CBSA metros on this site (94.6% of 241 monitored days). Signature read: 94.6% 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 35 over 241 measured days in 2025 (Good / Excellent). The monitored-day split lands at 228 Good (95%), 13 Moderate (5%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 48; the highest single-day reading hit 93 (Moderate).
Across 2020–2025, Good-day share shifted -5.4 points and median AQI moved +4 (worsening). No Unhealthy-tier days appear in this annual dataset. Metros with comparable AQI profiles include Baraboo, WI (75.6% good, AQI 35); Effingham, IL (95.5% good, AQI 35); Ithaca, NY (93.2% good, AQI 35).
Air Quality Summary
Median AQI
35
Good
Good Days
94.6%
228 of 241 days
Max AQI
93
Moderate
Health Grade
Excellent
90th pct: 48
AQI Day Breakdown (2025)
Distribution of 241 monitored days across EPA AQI categories.
Good
228
95%
Moderate
13
5%
USG
0
0%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Health Impact Assessment
The Meridian, MS metro area's air quality is rated Excellent based on 94.6% 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 Meridian, MS metro compare?
How Meridian, MS compares
5-Year Air Quality Trend
Air quality is worsening in the Meridian, MS metro. Highest Good-day share: 2020 (100.0%, 252 of 252 monitored days).
| Year | Good | Moderate | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|
| 2020 | 252 | 0 | 0 | 31 | 50 |
| 2021 | 244 | 1 | 0 | 31 | 54 |
| 2022 | 230 | 10 | 0 | 36 | 77 |
| 2023 | 227 | 15 | 0 | 38 | 87 |
| 2024 | 242 | 1 | 0 | 36 | 51 |
| 2025 | 228 | 13 | 0 | 35 | 93 |
Metros with a similar median AQI
CBSA peers nationwide whose annual median AQI sits near Meridian, MS (35).
Baraboo, WI
Median AQI 35 · 75.6% Good-day share
Effingham, IL
Median AQI 35 · 95.5% Good-day share
Ithaca, NY
Median AQI 35 · 93.2% Good-day share
Kinston, NC
Median AQI 35 · 97.5% Good-day share
Morehead City, NC
Median AQI 35 · 96.2% Good-day share
Salem, OR
Median AQI 35 · 80.0% Good-day share
Metros with similar unhealthy-day exposure
A second relationship type: metros whose unhealthy-or-worse day count is closest to Meridian, MS'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 Meridian, MS have? ▼
What is the air quality in the Meridian, MS metro area? ▼
Is air quality in Meridian, MS getting better or worse? ▼
What does AQI 35 mean for health? ▼
How does Meridian, MS compare to other metro areas? ▼
What is the 90th percentile AQI for Meridian, MS? ▼
Data Sources
Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset for Meridian, MS, 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, Meridian, MS · 2020–2025