Median AQI
41
Good
Louisiana · County air quality · 2025
Tangipahoa County, Louisiana
Median AQI 41 (Good). 79.5% of monitored days rated Good, direct from EPA Air Quality System stations.
- 41
- Median AQI
- 79.5%
- Good-air days
- 0
- Unhealthy days
- 55%
- Cleaner than US counties
Tangipahoa County's 2025 annual median AQI is 41 (Good), with 79.5% Good days
According to the U.S. EPA Air Quality System, Tangipahoa County, Louisiana posted a 2025 median AQI of 41 (Good) across 122 monitored days, with 79.5% rated Good and 0 unhealthy or worse. This is an annual comparison, not today's advisory.
Data source EPA Air Quality System (AQS)
- Cleaner than US
- Tangipahoa County's 79.5% Good-day share places it cleaner than 55% of US counties in 2025.
- Closest median-AQI peer
- Armstrong County (70.5% Good, median AQI 41) is the closest nationwide median-AQI peer to Tangipahoa County.
- 2020–2025 trend
- Tangipahoa County's floor-qualifying Good-day share is improving from 2020 to 2025 (72.7% → 79.5%).
- Median AQI
- Median AQI: 41
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 41 with 79.5% of 122 monitored days in the Good band, driven mainly by PM2.5.
- 41
- median AQI · Good
- 79.5%
- days rated Good
- PM2.5
- main pollutant
- 55%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 64.
Annual release change
What changed in the 2025 EPA annual release
- Tangipahoa County's Good-day share rose from 52.8% to 79.5% between the 2024 and 2025 EPA annual releases, a change of +26.8 percentage points.
- Tangipahoa County's median AQI fell from 47 to 41 between the 2024 and 2025 EPA annual releases, a change of -6 points.
- Tangipahoa County's peak single-day AQI fell from 77 to 64 between the 2024 and 2025 EPA annual releases, a change of -13 points.
Data updated August 2026
- Good · 97 d · 79.5%
- Moderate · 25 d · 20.5%
How did Tangipahoa County's air break down in 2025?
Across 122 monitored days, 97 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 64 (Moderate).
EPA AQS →Air quality data from EPA Air Quality System (2025). 122 days monitored. Median AQI: 41 (Good).
Insights: Tangipahoa County, Louisiana. EPA monitors recorded a median Air Quality Index of 41 across 122 measured days in 2025, earning a Good classification and a Good health grade. Of those days, 97 (80%) fell in the Good band (AQI 0–50), 25 (20%) 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 64 (Moderate). Residents averaged about 23.9 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as PM2.5 (122 days). Across the 2020–2025 trend window, the share of monitored days rated Good shifted by +6.8 points and the median AQI moved +7 points, placing the multi-year trajectory at improving. The worst single reading over the 2020–2025 window was AQI 64, moderate but never Unhealthy. Nearby counties show comparable readings: Ascension (95.6% good, AQI 33); Bossier (78.9% good, AQI 42); Caddo (80.0% good, AQI 38); Calcasieu (62.2% good, AQI 47); East Baton Rouge (49.6% good, AQI 51); Iberville (78.6% good, AQI 40).
Air Quality Summary
Good Days
79.5%
97 of 122 monitored days
4.5pp vs 75% target
Max AQI Recorded
64
Moderate
Health Grade
Good
90th-pct AQI 53
Tangipahoa County, Good days share 79.5%
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 122 monitored days across EPA AQI categories.
Good
97
80%
Moderate
25
20%
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 · 122 days · 100.0%
Health Impact Assessment
Good
Tangipahoa County's air quality is rated Good based on 79.5% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 79.5% of monitored days in 2025, with a median AQI of 41. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is PM2.5, driving AQI on 122 of 122 monitored days.
5-Year Air Quality Trend
Air quality is improving in Tangipahoa County. Highest Good-day share: 2025 (79.5%, 97 of 122 monitored 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 | 97 | 25 | 0 | 0 | 41 | 64 |
How does Tangipahoa County compare?
How Tangipahoa County compares
Good-day share better than typical
Tangipahoa County 79.5%
Armstrong County, Pennsylvania 70.5%
Typical US county 76.0%
Median AQI worse than typical
Tangipahoa County 41
Armstrong County, Pennsylvania 41
Typical US county 39
Unhealthy days / yr better than typical
Tangipahoa County 0
Armstrong County, Pennsylvania 0
Typical US county 1
Counties with a similar median AQI
Nationwide peers within about the same annual median AQI as Tangipahoa County (41), not geographic neighbors.
Armstrong County, Pennsylvania
Median AQI 41 · 70.5% Good-day share
Benewah County, Idaho
Median AQI 41 · 63.4% Good-day share
Berrien County, Michigan
Median AQI 41 · 80.9% Good-day share
Callaway County, Missouri
Median AQI 41 · 89.6% Good-day share
Cambria County, Pennsylvania
Median AQI 41 · 74.5% Good-day share
Cass County, Missouri
Median AQI 41 · 77.6% Good-day share
Same primary pollutant: PM2.5
PM2.5 led the AQI on the most monitored days here. These peers share that driver and the closest Good-day share (a second relationship type beyond median-AQI neighbors).
Manistee County, Michigan
79.5% Good-day share · median AQI 33
Martin County, Florida
79.5% Good-day share · median AQI 40
Salem City County, Virginia
79.7% Good-day share · median AQI 31
Grant County, Washington
79.7% Good-day share · median AQI 28
Ravalli County, Montana
79.2% Good-day share · median AQI 21
Anchorage County, Alaska
79.2% Good-day share · median AQI 26
Louisiana counties on the map
Geographic containment only, other monitored counties in Louisiana, independent of AQI or pollutant match.
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 41 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 122 EPA-monitored days in 2025; figures reflect only days the monitors reported. Source: EPA Air Quality System annual summaries.
Keep exploring the annual AQI record
Air-quality reading list
Frequently Asked Questions
What is the air quality in Tangipahoa County, Louisiana? ▼
Tangipahoa County has a median Air Quality Index (AQI) of 41, rated "Good." 79.5% of monitored days (97 out of 122) 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 122 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 64.
Is the air quality in Tangipahoa County getting better or worse? ▼
Air quality in Tangipahoa County 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 79.5% (97 of 122 days). Lowest qualifying Good-day share: 2024 at 52.8% (67 of 127 days).
What does AQI 41 mean for health? ▼
Tangipahoa County's median AQI of 41 falls in the "Good" category. See the AQI category guide for what each range means for health.
How does Tangipahoa County compare to other counties in Louisiana? ▼
Tangipahoa County has 79.5% good air days. Nearby counties in Louisiana: Ascension (95.6% good), Bossier (78.9% good), Caddo (80.0% good), Calcasieu (62.2% good), East Baton Rouge (49.6% good), Iberville (78.6% 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 64 (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. Spotted a figure that looks wrong? Report a correction.
Source: U.S. EPA Air Quality System (AQS) Annual AQI by county summary files for Tangipahoa County, Louisiana · 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.