Metro area air quality · 2025

Hattiesburg, MS

Median AQI 45 (Good). 62.3% of monitored days rated Good across this metro's EPA monitoring network.

45
Median AQI
62.3%
Good-air days
0
Unhealthy days
30%
Cleaner than US metros

Hattiesburg, MS posted a 2025 median AQI of 45 (Good) with 62.3% Good days

According to the U.S. EPA Air Quality System, the Hattiesburg, MS CBSA recorded a median AQI of 45 across 363 monitored days in 2025, with 62.3% 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 Hattiesburg, MS CBSA's 62.3% Good-day share places it cleaner than 30% of US metros in 2025.
Closest median-AQI peer
Akron, OH (61.6% Good, median AQI 45) is the closest nationwide median-AQI peer to Hattiesburg, MS.
2020–2025 Good-day shift
Hattiesburg, MS's Good-day share moved +8.0 points from 2020 to 2025 (median AQI -3).
Median AQI
Median AQI: 45

Aggregated from EPA Air Quality System (2025), 363 monitored days. EPA AQS →

The verdict

Hattiesburg, MS lands in the lower Good-day tercile (62.3% Good), a thinner clean-air share than most CBSA peers here. On the EPA scale the metro runs good, more polluted than the median US metro, with a median AQI of 45 and 62.3% of 363 monitored days in the Good band.

45
median AQI · Good
62.3%
days rated Good
30%
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

2024 → 2025
  • Hattiesburg, MS metro's Good-day share rose from 56.0% to 62.3% between the 2024 and 2025 EPA annual releases, a change of +6.3 percentage points.

Compared against 361 monitored days in 2024 and 363 in 2025. These are arithmetic differences between two stored EPA annual summaries, not a cause claim or a live advisory.

National release changes Two-year CSV

Hattiesburg, MS lands in the lower Good-day tercile (62.3% Good), a thinner clean-air share than most CBSA peers here. Signature read: 62.3% Good-day share (low tercile vs CBSA corpus). Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 45 over 363 measured days in 2025 (Good / Moderate). The monitored-day split lands at 226 Good (62%), 137 Moderate (38%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 59; the highest single-day reading hit 97 (Moderate).

Across 2020–2025, Good-day share shifted +8.0 points and median AQI moved -3 (improving). No Unhealthy-tier days appear in this annual dataset. Metros with comparable AQI profiles include Akron, OH (61.6% good, AQI 45); Ardmore, OK (67.9% good, AQI 45); Asheville, NC (69.9% good, AQI 45).

Health effects of air pollution →

Air Quality Summary

Median AQI

45

Good

Good Days

62.3%

226 of 363 days

Max AQI

97

Moderate

Health Grade

Moderate

90th pct: 59

AQI Day Breakdown (2025)

Distribution of 363 monitored days across EPA AQI categories.

Good

226

62%

Moderate

137

38%

USG

0

0%

Unhealthy

0

0%

Very Unhealthy

0

0%

Hazardous

0

0%

Health Impact Assessment

Moderate

The Hattiesburg, MS metro area's air quality is rated Moderate based on 62.3% 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 Hattiesburg, MS metro compare?

How Hattiesburg, MS compares

Good-day share worse than typical
Hattiesburg, MS 62.3%
Akron, OH 61.6%
Typical US metro 70.6%
Median AQI worse than typical
Hattiesburg, MS 45
Akron, OH 45
Typical US metro 41
Unhealthy days / yr better than typical
Hattiesburg, MS 0
Akron, OH 0
Typical US metro 1

5-Year Air Quality Trend

Air quality is improving in the Hattiesburg, MS metro. Highest Good-day share: 2025 (62.3%, 226 of 363 monitored days).

Year Good Moderate Unhealthy Median AQI
2020 196 165 0 48
2021 178 185 0 51
2022 178 186 0 51
2023 145 220 0 53
2024 202 159 0 47
2025 226 137 0 45

Metros with a similar median AQI

CBSA peers nationwide whose annual median AQI sits near Hattiesburg, MS (45).

Akron, OH

Median AQI 45 · 61.6% Good-day share

45

Ardmore, OK

Median AQI 45 · 67.9% Good-day share

45

Asheville, NC

Median AQI 45 · 69.9% Good-day share

45

Cheyenne, WY

Median AQI 45 · 75.1% Good-day share

45

Clinton, IA

Median AQI 45 · 59.5% Good-day share

45

Fort Dodge, IA

Median AQI 45 · 59.2% Good-day share

45

Metros with similar unhealthy-day exposure

A second relationship type: metros whose unhealthy-or-worse day count is closest to Hattiesburg, MS's 0 (independent of median AQI).

Aberdeen, SD

0 unhealthy-or-worse days · median AQI 27

27

Aberdeen, WA

0 unhealthy-or-worse days · median AQI 22

22

Adrian, MI

0 unhealthy-or-worse days · median AQI 41

41

Albany, GA

0 unhealthy-or-worse days · median AQI 46

46

Albany, OR

0 unhealthy-or-worse days · median AQI 27

27

Albany-Schenectady-Troy, NY

0 unhealthy-or-worse days · median AQI 41

41

Frequently Asked Questions

How many unhealthy air days does Hattiesburg, MS have? ▼
In 2025, the Hattiesburg, MS metro area recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 97.
What is the air quality in the Hattiesburg, MS metro area? ▼
The Hattiesburg, MS metro area has a median Air Quality Index (AQI) of 45, rated "Good." 62.3% of monitored days (226 out of 363) had good air quality in 2025.
Is air quality in Hattiesburg, MS getting better or worse? ▼
Air quality in the Hattiesburg, MS metro is improving across floor-qualifying years (2020-2025); years with fewer than 100 monitored days are excluded from that direction. Highest qualifying Good-day share: 2025 at 62.3% (226 of 363 days). Lowest qualifying Good-day share: 2023 at 39.7% (145 of 365 days).
What does AQI 45 mean for health? ▼
An AQI of 45 is "Good", air quality is satisfactory and poses little or no health risk. This is the best category on the EPA's AQI scale.
How does Hattiesburg, MS compare to other metro areas? ▼
The Hattiesburg, MS metro has 62.3% good air days. Similar metros: Akron, OH (61.6% good), Ardmore, OK (67.9% good), Asheville, NC (69.9% good).
What is the 90th percentile AQI for Hattiesburg, MS? ▼
The 90th percentile AQI for the Hattiesburg, MS metro area is 59, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 97 (Moderate).

Data Sources

Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset for Hattiesburg, 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, Hattiesburg, MS · 2020–2025