Metro area air quality · 2025

Houma-Thibodaux, LA

Median AQI 47 (Good). 60.4% of monitored days rated Good across this metro's EPA monitoring network.

47
Median AQI
60.4%
Good-air days
0
Unhealthy days
24%
Cleaner than US metros

Aggregated from EPA Air Quality System (2025), 273 monitored days. EPA AQS →

The verdict

The Houma-Thibodaux, LA metro runs good on the EPA scale, among the more polluted US metros, a median AQI of 47 with 60.4% of 273 monitored days in the Good band.

47
median AQI · Good
60.4%
days rated Good
24%
cleaner than US metros
77
worst single reading

No day crossed into the Unhealthy tier across the metro's monitors in 2025.

Insights: Houma-Thibodaux, LA metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 47 over 273 measured days in 2025, which corresponds to a Good band and a Moderate metro-wide health grade. The monitored-day split lands at 165 Good days (60%), 108 Moderate (40%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 58 while the highest single-day reading hit 77 (Moderate). Metro residents averaged roughly 18.1 clean-air days per 30-day window across the reporting year.

Across the 2020–2025 trend window, good days shifted by -47 and the median AQI moved -1 points, which classifies the multi-year trajectory as stable. The metro avoided any Unhealthy-tier days entirely, an outcome that typically reflects favorable wind patterns, lower industrial density, or effective regional emission controls. Metros with comparable AQI profiles include Ardmore, OK (65.3% good, AQI 47); Baltimore-Columbia-Towson, MD (62.2% good, AQI 47); Boise City, ID (64.7% good, AQI 47).

Air Quality Summary

Median AQI

47

Good

Good Days

60.4%

165 of 273 days

Max AQI

77

Moderate

Health Grade

Moderate

90th pct: 58

AQI Day Breakdown (2025)

Distribution of 273 monitored days across EPA AQI categories.

Good

165

60%

Moderate

108

40%

USG

0

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 60.4% 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 Houma-Thibodaux, LA metro compare?

How Houma-Thibodaux, LA compares

Good-day share worse than US avg
Houma-Thibodaux, LA 60.4%
Ardmore, OK 65.3%
US average 71.3%
Median AQI worse than US avg
Houma-Thibodaux, LA 47
Ardmore, OK 47
US average 41
Unhealthy days / yr better than US avg
Houma-Thibodaux, LA 0
Ardmore, OK 2
US average 1

5-Year Air Quality Trend

Air quality is stable in the Houma-Thibodaux, LA metro. Best year: 2022 (238 good 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 165 108 0 47

Metros with Similar Air Quality

Metro areas across the US with a similar median AQI to Houma-Thibodaux, LA.

Ardmore, OK

AQI 47 · 65.3% good

47

Baltimore-Columbia-Towson, MD

AQI 47 · 62.2% good

47

Boise City, ID

AQI 47 · 64.7% good

47

Cheyenne, WY

AQI 47 · 69.8% good

47

Chico, CA

AQI 47 · 66.1% good

47

Columbus, GA-AL

AQI 47 · 58.8% good

47

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 47, rated "Good." 60.4% of monitored days (165 out of 273) 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 77.
Is air quality in Houma-Thibodaux, LA getting better or worse? ▼
Air quality in the Houma-Thibodaux, LA metro is stable based on 5-year trends (2020-2025). Best year: 2022 with 238 good days. Worst year: 2023 with 150 good days.
What does AQI 47 mean for health? ▼
An AQI of 47 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 77 (Moderate).
How does Houma-Thibodaux, LA compare to other metro areas? ▼
The Houma-Thibodaux, LA metro has 60.4% good air days. Similar metros: Ardmore, OK (65.3% good), Baltimore-Columbia-Towson, MD (62.2% good), Boise City, ID (64.7% 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

Every figure on PlainAir 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.