Metro area air quality · 2025

Houma-Thibodaux, LA

Median AQI 45 (Good). 64.9% of monitored days rated Good across this metro's EPA monitoring network.

45
Median AQI
64.9%
Good-air days
0
Unhealthy days
34%
Cleaner than US metros

Houma-Thibodaux, LA posted a 2025 median AQI of 45 (Good) with 64.9% Good days

According to the U.S. EPA Air Quality System, the Houma-Thibodaux, LA CBSA recorded a median AQI of 45 across 365 monitored days in 2025, with 64.9% 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 Houma-Thibodaux, LA CBSA's 64.9% Good-day share places it cleaner than 34% 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 Houma-Thibodaux, LA.
2020–2025 Good-day shift
Houma-Thibodaux, LA's Good-day share moved +7.0 points from 2020 to 2025 (median AQI -3).
Median AQI
Median AQI: 45

Aggregated from EPA Air Quality System (2025), 365 monitored days. EPA AQS →

The verdict

The Houma-Thibodaux, LA metro runs good on the EPA scale, more polluted than the median US metro, a median AQI of 45 with 64.9% of 365 monitored days in the Good band.

45
median AQI · Good
64.9%
days rated Good
34%
cleaner than US metros
109
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
  • Houma-Thibodaux, LA metro's Good-day share rose from 53.5% to 65.1% between the 2024 and 2025 EPA annual releases, a change of +11.6 percentage points.
  • Houma-Thibodaux, LA metro's median AQI fell from 48 to 45 between the 2024 and 2025 EPA annual releases, a change of -3 points.

Compared against 361 monitored days in 2024 and 364 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

Insights: Houma-Thibodaux, LA metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 45 over 365 measured days in 2025, which corresponds to a Good band and a Moderate metro-wide health grade. The monitored-day split lands at 237 Good days (65%), 127 Moderate (35%), and 1 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 58 while the highest single-day reading hit 109 (USG). Metro residents averaged roughly 19.5 clean-air days per 30-day window across the reporting year.

Across the 2020–2025 trend window, the share of monitored days rated Good shifted by +7.0 points and the median AQI moved -3 points, which classifies the multi-year trajectory as improving. The metro recorded no Unhealthy-tier days 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).

Air Quality Summary

Median AQI

45

Good

Good Days

64.9%

237 of 365 days

Max AQI

109

USG

Health Grade

Moderate

90th pct: 58

AQI Day Breakdown (2025)

Distribution of 365 monitored days across EPA AQI categories.

Good

237

65%

Moderate

127

35%

USG

1

0%

Unhealthy

0

0%

Very Unhealthy

0

0%

Hazardous

0

0%

Health Impact Assessment

Moderate

The Houma-Thibodaux, LA metro area's air quality is rated Moderate based on 64.9% 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 Houma-Thibodaux, LA metro compare?

How Houma-Thibodaux, LA compares

Good-day share worse than typical
Houma-Thibodaux, LA 64.9%
Akron, OH 61.6%
Typical US metro 70.6%
Median AQI worse than typical
Houma-Thibodaux, LA 45
Akron, OH 45
Typical US metro 41
Unhealthy days / yr better than typical
Houma-Thibodaux, LA 0
Akron, OH 0
Typical US metro 1

5-Year Air Quality Trend

Air quality is improving in the Houma-Thibodaux, LA metro. Highest Good-day share: 2022 (67.0%, 238 of 355 monitored days).

Year Good Moderate Unhealthy Median AQI
2020 212 153 0 48
2021 200 149 0 46
2022 238 117 0 44
2023 150 211 1 53
2024 193 168 0 48
2025 237 127 0 45

Metros with a similar median AQI

CBSA peers nationwide whose annual median AQI sits near Houma-Thibodaux, LA (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 Houma-Thibodaux, LA'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

More Air Quality Data

Explore EPA air quality rankings and guides across U.S. metros and counties.

Cleanest Metro Areas

U.S. metros ranked by their share of Good air-quality days.

Worst Air Quality

Counties and metros with the most unhealthy air days.

All Metro Areas

Annual AQI by CBSA for every monitored U.S. metro area.

Best and Worst City Air

What drives urban air quality and how metro areas compare.

Air Quality Guides

Frequently Asked Questions

What is the air quality in the Houma-Thibodaux, LA metro area? ▼
The Houma-Thibodaux, LA metro area has a median Air Quality Index (AQI) of 45, rated "Good." 64.9% of monitored days (237 out of 365) had good air quality in 2025.
How many unhealthy air days does Houma-Thibodaux, LA have? ▼
In 2025, the Houma-Thibodaux, LA metro area recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 109.
Is air quality in Houma-Thibodaux, LA getting better or worse? ▼
Air quality in the Houma-Thibodaux, LA 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: 2022 at 67.0% (238 of 355 days). Lowest qualifying Good-day share: 2023 at 41.4% (150 of 362 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.
What is the 90th percentile AQI for Houma-Thibodaux, LA? ▼
The 90th percentile AQI for the Houma-Thibodaux, LA metro area is 58, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 109 (USG).
How does Houma-Thibodaux, LA compare to other metro areas? ▼
The Houma-Thibodaux, LA metro has 64.9% good air days. Similar metros: Akron, OH (61.6% good), Ardmore, OK (67.9% good), Asheville, NC (69.9% good).

Data Sources

Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset, 2020–2025. 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 files (metro-level) · 2020–2025

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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.