Median AQI
51
Moderate
Louisiana · County air quality · 2025
East Baton Rouge County, Louisiana
Median AQI 51 (Moderate). 49.3% of monitored days rated Good, direct from EPA Air Quality System stations.
- 51
- Median AQI
- 49.3%
- Good-air days
- 0
- Unhealthy days
- 6%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, East Baton Rouge County's air is moderate on balance, among the most polluted counties nationally, a median AQI of 51 with 49.3% of 274 monitored days in the Good band, driven mainly by PM2.5.
- 51
- median AQI · Moderate
- 49.3%
- days rated Good
- PM2.5
- main pollutant
- 6%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 115.
Data updated July 2026
- Good · 135 d · 49.3%
- Moderate · 138 d · 50.4%
- USG · 1 d · 0.4%
How did East Baton Rouge County's air break down in 2025?
Across 274 monitored days, 135 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 115 (USG).
EPA AQS →Air quality data from EPA Air Quality System (2025). 274 days monitored. Median AQI: 51 (Moderate).
Insights: East Baton Rouge County, Louisiana. EPA monitors recorded a median Air Quality Index of 51 across 274 measured days in 2025, earning a Moderate classification and a Poor health grade. Of those days, 135 (49%) fell in the Good band (AQI 0–50), 138 (50%) registered Moderate readings, and 1 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 63, while the worst single-day peak hit 115 (USG). Residents averaged about 14.8 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as PM2.5 (184 days), Ozone (88 days), PM10 (1 days), CO (1 days). Across the 2020–2025 trend window, good days shifted by -101 and the median AQI moved +6 points, placing the multi-year trajectory at worsening. The worst single reading over the 2020–2025 window was AQI 115, usg 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); Iberville (78.4% good, AQI 41); Jefferson (58.6% good, AQI 48).
Air Quality Summary
Good Days
49.3%
135 of 274 monitored days
-25.7pp vs 75% target
Max AQI Recorded
115
USG
Health Grade
Poor
90th-pct AQI 63
East Baton Rouge County, Good days share 49.3%
National avg
Share of monitored days at AQI 0-50 (Good band).
East Baton Rouge 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 274 monitored days across EPA AQI categories.
Good
135
49%
Moderate
138
50%
USG
1
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 East Baton Rouge County.
- PM2.5 · 184 days · 67.2%
- Ozone · 88 days · 32.1%
- PM10 · 1 days · 0.4%
- CO · 1 days · 0.4%
Health Impact Assessment
Poor
East Baton Rouge County's air quality is rated Poor based on 49.3% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 49.3% of monitored days in 2025, with a median AQI of 51. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is PM2.5, driving AQI on 184 of 274 monitored days.
5-Year Air Quality Trend
Air quality is worsening in East Baton Rouge County. Best year: 2020 (236 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 236 | 127 | 3 | 0 | 45 | 119 |
| 2021 | 217 | 145 | 2 | 1 | 47 | 159 |
| 2022 | 205 | 157 | 3 | 0 | 48 | 141 |
| 2023 | 149 | 208 | 8 | 0 | 52 | 147 |
| 2024 | 179 | 180 | 6 | 1 | 51 | 154 |
| 2025 | 135 | 138 | 1 | 0 | 51 | 115 |
How does East Baton Rouge County compare?
How East Baton Rouge County compares
Good-day share worse than US avg
East Baton Rouge County 49.3%
Ascension County, Louisiana 94.1%
US average 76.5%
Median AQI worse than US avg
East Baton Rouge County 51
Ascension County, Louisiana 33
US average 38
Unhealthy days / yr about average
East Baton Rouge 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 East Baton Rouge County.
Arapahoe County, Colorado
AQI 51 · 47.3% good
Bibb County, Georgia
AQI 51 · 49.5% good
Eddy County, New Mexico
AQI 51 · 46.9% good
Hillsborough County, Florida
AQI 51 · 49.3% good
Jefferson County, Colorado
AQI 51 · 46.5% good
Mecklenburg County, North Carolina
AQI 51 · 49.2% good
What East Baton Rouge 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 51 means for exposure. Health guidance
- See how East Baton Rouge County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare East Baton Rouge County with its Louisiana neighbours before drawing a conclusion about the region. All of Louisiana
Based on 274 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 East Baton Rouge County, Louisiana? ▼
East Baton Rouge County has a median Air Quality Index (AQI) of 51, rated "Moderate." 49.3% of monitored days (135 out of 274) had good air quality in 2025.
What is the main pollutant in East Baton Rouge County? ▼
The primary pollutant in East Baton Rouge County is Fine Particles (PM2.5), which was the main AQI driver on 184 days (67% of monitored days). Penetrates deep into lungs and bloodstream. Linked to heart disease and premature death.
How many unhealthy air days does East Baton Rouge County have? ▼
In 2025, East Baton Rouge County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 115.
Is the air quality in East Baton Rouge County getting better or worse? ▼
Air quality in East Baton Rouge County is worsening based on 5-year trends (2020-2025). Best year: 2020 with 236 good days. Worst year: 2025 with 135 good days.
What does AQI 51 mean for health? ▼
East Baton Rouge County's median AQI of 51 falls in the "Moderate" category. See the <a href="/guides/understanding-aqi" class="underline">AQI category guide</a> for what each range means for health.
How does East Baton Rouge County compare to other counties in Louisiana? ▼
East Baton Rouge County has 49.3% good air days. Nearby counties in Louisiana: Ascension (94.1% good), Bossier (86.5% good), Caddo (84.3% good), Calcasieu (61.5% good), Iberville (78.4% good), Jefferson (58.6% good).
What is the 90th percentile AQI in East Baton Rouge County? ▼
The 90th percentile AQI for East Baton Rouge County is 63, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 115 (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.
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.