Median AQI
38
Good
Louisiana · County air quality · 2025
Tangipahoa County, Louisiana
Median AQI 38 (Good). 82.3% of monitored days rated Good, direct from EPA Air Quality System stations.
- 38
- Median AQI
- 82.3%
- Good-air days
- 0
- Unhealthy days
- 58%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Tangipahoa County's air is good on balance, cleaner than the median US county, a median AQI of 38 with 82.3% of 62 monitored days in the Good band, driven mainly by PM2.5.
- 38
- median AQI · Good
- 82.3%
- days rated Good
- PM2.5
- main pollutant
- 58%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 63.
Data updated July 2026
- Good · 51 d · 82.3%
- Moderate · 11 d · 17.7%
How did Tangipahoa County's air break down in 2025?
Across 62 monitored days, 51 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 63 (Moderate).
EPA AQS →Air quality data from EPA Air Quality System (2025). 62 days monitored. Median AQI: 38 (Good).
Insights: Tangipahoa County, Louisiana. EPA monitors recorded a median Air Quality Index of 38 across 62 measured days in 2025, earning a Good classification and a Good health grade. Of those days, 51 (82%) fell in the Good band (AQI 0–50), 11 (18%) registered Moderate readings, and 0 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 53, while the worst single-day peak hit 63 (Moderate). Residents averaged about 24.7 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as PM2.5 (62 days). Across the 2020–2025 trend window, good days shifted by -37 and the median AQI moved +4 points, placing the multi-year trajectory at improving. The worst single reading over the 2020–2025 window was AQI 63, moderate but never Unhealthy. Nearby counties show comparable readings: Ascension (94.1% good, AQI 33); Bossier (86.5% good, AQI 40); Caddo (84.3% good, AQI 38); Calcasieu (61.5% good, AQI 47); East Baton Rouge (49.3% good, AQI 51); Iberville (78.4% good, AQI 41).
Air Quality Summary
Good Days
82.3%
51 of 62 monitored days
7.3pp vs 75% target
Max AQI Recorded
63
Moderate
Health Grade
Good
90th-pct AQI 53
Tangipahoa County, Good days share 82.3%
National avg
Share of monitored days at AQI 0-50 (Good band).
Tangipahoa County, Unhealthy-or-worse share 0.0%
National avg
Share of monitored days above AQI 150 (Unhealthy or worse). Bar maxes at 10% (worst-county ceiling).
AQI Day Breakdown (2025)
Distribution of 62 monitored days across EPA AQI categories.
Good
51
82%
Moderate
11
18%
USG
0
0%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Pollutant Breakdown
Days where each pollutant was the primary driver of AQI readings in Tangipahoa County.
- PM2.5 · 62 days · 100.0%
Health Impact Assessment
Good
Tangipahoa County's air quality is rated Good based on 82.3% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 82.3% of monitored days in 2025, with a median AQI of 38. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is PM2.5, driving AQI on 62 of 62 monitored days.
5-Year Air Quality Trend
Air quality is improving in Tangipahoa County. Best year: 2022 (89 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 88 | 33 | 0 | 0 | 34 | 68 |
| 2021 | 81 | 29 | 0 | 0 | 39 | 65 |
| 2022 | 89 | 35 | 0 | 0 | 38 | 97 |
| 2023 | 81 | 43 | 0 | 0 | 43 | 71 |
| 2024 | 67 | 60 | 0 | 0 | 47 | 77 |
| 2025 | 51 | 11 | 0 | 0 | 38 | 63 |
How does Tangipahoa County compare?
How Tangipahoa County compares
Good-day share better than US avg
Tangipahoa County 82.3%
Ascension County, Louisiana 94.1%
US average 76.5%
Median AQI about average
Tangipahoa County 38
Ascension County, Louisiana 33
US average 38
Unhealthy days / yr about average
Tangipahoa County 0
Ascension County, Louisiana 0
US average 0
Other Counties in Louisiana
Air quality comparison for nearby counties in Louisiana.
Counties with Similar Air Quality
Counties across the US with a similar median AQI to Tangipahoa County.
Adams County, Illinois
AQI 38 · 94.4% good
Anoka County, Minnesota
AQI 38 · 82.1% good
Atlantic County, New Jersey
AQI 38 · 79.6% good
Avery County, North Carolina
AQI 38 · 93.9% good
Barnstable County, Massachusetts
AQI 38 · 92.5% good
Bay County, Michigan
AQI 38 · 71.8% good
What Tangipahoa County's air means for you
The air here stays in the breathable range year-round, with PM2.5 the main thing to watch.
- Sensitive groups (asthma, heart conditions, children, older adults) should check the AQI on high-PM2.5 days, the guide explains what a median of 38 means for exposure. Health guidance
- See how Tangipahoa County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Tangipahoa County with its Louisiana neighbours before drawing a conclusion about the region. All of Louisiana
Based on 62 EPA-monitored days in 2025; figures reflect only days the monitors reported. Source: EPA Air Quality System annual summaries.
More Air Quality Data
Air Quality Guides
Frequently Asked Questions
What is the air quality in Tangipahoa County, Louisiana? ▼
Tangipahoa County has a median Air Quality Index (AQI) of 38, rated "Good." 82.3% of monitored days (51 out of 62) had good air quality in 2025.
What is the main pollutant in Tangipahoa County? ▼
The primary pollutant in Tangipahoa County is Fine Particles (PM2.5), which was the main AQI driver on 62 days (100% of monitored days). Penetrates deep into lungs and bloodstream. Linked to heart disease and premature death.
How many unhealthy air days does Tangipahoa County have? ▼
In 2025, Tangipahoa County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 63.
Is the air quality in Tangipahoa County getting better or worse? ▼
Air quality in Tangipahoa County is improving based on 5-year trends (2020-2025). Best year: 2022 with 89 good days. Worst year: 2025 with 51 good days.
What does AQI 38 mean for health? ▼
Tangipahoa County's median AQI of 38 falls in the "Good" category. See the <a href="/guides/understanding-aqi" class="underline">AQI category guide</a> for what each range means for health.
How does Tangipahoa County compare to other counties in Louisiana? ▼
Tangipahoa County has 82.3% good air days. Nearby counties in Louisiana: Ascension (94.1% good), Bossier (86.5% good), Caddo (84.3% good), Calcasieu (61.5% good), East Baton Rouge (49.3% good), Iberville (78.4% good).
What is the 90th percentile AQI in Tangipahoa County? ▼
The 90th percentile AQI for Tangipahoa County is 53, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 63 (Moderate).
Data Sources
Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by County dataset, 2020–2025 (aqs.epa.gov). For current conditions (not shown here — this page is historical annual data), see EPA AirNow (airnow.gov). See our methodology for how AQI, median, and coverage figures are computed.
Informational only, not professional advice. Data from EPA AQS. See our disclaimer.
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.