Median AQI
47
Good
Louisiana · County air quality · 2025
Calcasieu County, Louisiana
Median AQI 47 (Good). 62.2% of monitored days rated Good, direct from EPA Air Quality System stations.
- 47
- Median AQI
- 62.2%
- Good-air days
- 0
- Unhealthy days
- 18%
- Cleaner than US counties
Calcasieu County's 2025 annual median AQI is 47 (Good), with 62.2% Good days
According to the U.S. EPA Air Quality System, Calcasieu County, Louisiana posted a 2025 median AQI of 47 (Good) across 365 monitored days, with 62.2% 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
- Calcasieu County's 62.2% Good-day share places it cleaner than 18% of US counties in 2025.
- Closest median-AQI peer
- Bonner County (56.2% Good, median AQI 47) is the closest nationwide median-AQI peer to Calcasieu County.
- 2020–2025 trend
- Calcasieu County's floor-qualifying Good-day share is improving from 2020 to 2025 (51.3% → 62.2%).
- Median AQI
- Median AQI: 47
The verdict
According to EPA Air Quality System monitoring data, Calcasieu County's air is good on balance, among the more polluted 10% of US counties, a median AQI of 47 with 62.2% of 365 monitored days in the Good band, driven mainly by PM2.5.
- 47
- median AQI · Good
- 62.2%
- days rated Good
- PM2.5
- main pollutant
- 18%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 108.
Annual release change
What changed in the 2025 EPA annual release
- Calcasieu County's Good-day share rose from 53.0% to 62.2% between the 2024 and 2025 EPA annual releases, a change of +9.2 percentage points.
- Calcasieu County's peak single-day AQI fell from 147 to 108 between the 2024 and 2025 EPA annual releases, a change of -39 points.
Data updated August 2026
- Good · 227 d · 62.2%
- Moderate · 135 d · 37.0%
- USG · 3 d · 0.8%
How did Calcasieu County's air break down in 2025?
Across 365 monitored days, 227 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 108 (USG).
EPA AQS →Air quality data from EPA Air Quality System (2025). 365 days monitored. Median AQI: 47 (Good).
Insights: Calcasieu County, Louisiana. EPA monitors recorded a median Air Quality Index of 47 across 365 measured days in 2025, earning a Good classification and a Moderate health grade. Of those days, 227 (62%) fell in the Good band (AQI 0–50), 135 (37%) registered Moderate readings, and 3 (1%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 61, while the worst single-day peak hit 108 (USG). Residents averaged about 18.7 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as PM2.5 (229 days), Ozone (136 days). Across the 2020–2025 trend window, the share of monitored days rated Good shifted by +10.9 points and the median AQI moved -2 points, placing the multi-year trajectory at improving. The worst single reading over the 2020–2025 window was AQI 108, usg 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); East Baton Rouge (49.6% good, AQI 51); Iberville (78.6% good, AQI 40); Jefferson (62.2% good, AQI 47).
Air Quality Summary
Good Days
62.2%
227 of 365 monitored days
-12.8pp vs 75% target
Max AQI Recorded
108
USG
Health Grade
Moderate
90th-pct AQI 61
Calcasieu County, Good days share 62.2%
National avg
Share of monitored days at AQI 0-50 (Good band).
Calcasieu 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 365 monitored days across EPA AQI categories.
Good
227
62%
Moderate
135
37%
USG
3
1%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Pollutant Breakdown
Days where each pollutant was the primary driver of AQI readings in Calcasieu County.
- PM2.5 · 229 days · 62.7%
- Ozone · 136 days · 37.3%
Health Impact Assessment
Moderate
Calcasieu County's air quality is rated Moderate based on 62.2% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 62.2% of monitored days in 2025, with a median AQI of 47. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is PM2.5, driving AQI on 229 of 365 monitored days.
5-Year Air Quality Trend
Air quality is improving in Calcasieu County. Highest Good-day share: 2025 (62.2%, 227 of 365 monitored days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 179 | 169 | 1 | 0 | 49 | 116 |
| 2021 | 171 | 193 | 0 | 1 | 51 | 156 |
| 2022 | 167 | 198 | 0 | 0 | 52 | 100 |
| 2023 | 139 | 221 | 5 | 0 | 54 | 133 |
| 2024 | 194 | 168 | 4 | 0 | 49 | 147 |
| 2025 | 227 | 135 | 3 | 0 | 47 | 108 |
How does Calcasieu County compare?
How Calcasieu County compares
Good-day share worse than US avg
Calcasieu County 62.2%
Bonner County, Idaho 56.2%
US average 76.0%
Median AQI worse than US avg
Calcasieu County 47
Bonner County, Idaho 47
US average 39
Unhealthy days / yr better than US avg
Calcasieu County 0
Bonner County, Idaho 0
US average 1
Counties with a similar median AQI
Nationwide peers within about the same annual median AQI as Calcasieu County (47), not geographic neighbors.
Bonner County, Idaho
Median AQI 47 · 56.2% Good-day share
Charleston County, South Carolina
Median AQI 47 · 60.8% Good-day share
Chatham County, Georgia
Median AQI 47 · 58.6% Good-day share
DeKalb County, Georgia
Median AQI 47 · 58.4% Good-day share
Denton County, Texas
Median AQI 47 · 57.8% Good-day share
Fremont County, Wyoming
Median AQI 47 · 69.6% 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).
Jefferson County, Louisiana
62.2% Good-day share · median AQI 47
Ouachita County, Louisiana
62.2% Good-day share · median AQI 45
Forrest County, Mississippi
62.3% Good-day share · median AQI 45
Jackson County, Arkansas
62.3% Good-day share · median AQI 46
Livingston County, Louisiana
62.0% Good-day share · median AQI 45
Wyandotte County, Kansas
61.9% Good-day share · median AQI 45
Louisiana counties on the map
Geographic containment only, other monitored counties in Louisiana, independent of AQI or pollutant match.
What Calcasieu 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 47 means for exposure. Health guidance
- See how Calcasieu County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Calcasieu County with its Louisiana neighbours before drawing a conclusion about the region. All of Louisiana
Based on 365 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 Calcasieu County, Louisiana? ▼
Calcasieu County has a median Air Quality Index (AQI) of 47, rated "Good." 62.2% of monitored days (227 out of 365) had good air quality in 2025.
What is the main pollutant in Calcasieu County? ▼
The primary pollutant in Calcasieu County is Fine Particles (PM2.5), which was the main AQI driver on 229 days (63% of monitored days). Penetrates deep into lungs and bloodstream. Linked to heart disease and premature death.
How many unhealthy air days does Calcasieu County have? ▼
In 2025, Calcasieu County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 108.
Is the air quality in Calcasieu County getting better or worse? ▼
Air quality in Calcasieu 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 62.2% (227 of 365 days). Lowest qualifying Good-day share: 2023 at 38.1% (139 of 365 days).
What does AQI 47 mean for health? ▼
Calcasieu County's median AQI of 47 falls in the "Good" category. See the AQI category guide for what each range means for health.
How does Calcasieu County compare to other counties in Louisiana? ▼
Calcasieu County has 62.2% good air days. Nearby counties in Louisiana: Ascension (95.6% good), Bossier (78.9% good), Caddo (80.0% good), East Baton Rouge (49.6% good), Iberville (78.6% good), Jefferson (62.2% good).
What is the 90th percentile AQI in Calcasieu County? ▼
The 90th percentile AQI for Calcasieu County is 61, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 108 (USG).
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 Calcasieu 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.