Median AQI
42
Good
Louisiana · County air quality · 2025
Bossier County, Louisiana
Median AQI 42 (Good). 78.9% of monitored days rated Good, direct from EPA Air Quality System stations.
- 42
- Median AQI
- 78.9%
- Good-air days
- 0
- Unhealthy days
- 53%
- Cleaner than US counties
Bossier County's 2025 annual median AQI is 42 (Good), with 78.9% Good days
According to the U.S. EPA Air Quality System, Bossier County, Louisiana posted a 2025 median AQI of 42 (Good) across 365 monitored days, with 78.9% 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
- Bossier County's 78.9% Good-day share places it cleaner than 53% of US counties in 2025.
- Closest median-AQI peer
- Ada County (74.0% Good, median AQI 42) is the closest nationwide median-AQI peer to Bossier County.
- 2020–2025 trend
- Bossier County's floor-qualifying Good-day share is improving from 2020 to 2025 (74.3% → 78.9%).
- Median AQI
- Median AQI: 42
The verdict
According to EPA Air Quality System monitoring data, Bossier County's air is good on balance, cleaner than the median US county, a median AQI of 42 with 78.9% of 365 monitored days in the Good band, driven mainly by Ozone.
- 42
- median AQI · Good
- 78.9%
- days rated Good
- Ozone
- main pollutant
- 53%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 101.
Annual release change
What changed in the 2025 EPA annual release
- Bossier County's Good-day share rose from 57.4% to 78.9% between the 2024 and 2025 EPA annual releases, a change of +21.5 percentage points.
- Bossier County's median AQI fell from 47 to 42 between the 2024 and 2025 EPA annual releases, a change of -5 points.
- Bossier County's peak single-day AQI fell from 111 to 101 between the 2024 and 2025 EPA annual releases, a change of -10 points.
Data updated August 2026
- Good · 288 d · 78.9%
- Moderate · 76 d · 20.8%
- USG · 1 d · 0.3%
How did Bossier County's air break down in 2025?
Across 365 monitored days, 288 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 101 (USG).
EPA AQS →Air quality data from EPA Air Quality System (2025). 365 days monitored. Median AQI: 42 (Good).
Insights: Bossier County, Louisiana. EPA monitors recorded a median Air Quality Index of 42 across 365 measured days in 2025, earning a Good classification and a Good health grade. Of those days, 288 (79%) fell in the Good band (AQI 0–50), 76 (21%) registered Moderate readings, and 1 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 57, while the worst single-day peak hit 101 (USG). Residents averaged about 23.7 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as Ozone (225 days), PM2.5 (136 days), PM10 (4 days). Across the 2020–2025 trend window, the share of monitored days rated Good shifted by +4.6 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 101, usg but never Unhealthy. Nearby counties show comparable readings: Ascension (95.6% good, AQI 33); 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); Jefferson (62.2% good, AQI 47).
Air Quality Summary
Good Days
78.9%
288 of 365 monitored days
3.9pp vs 75% target
Max AQI Recorded
101
USG
Health Grade
Good
90th-pct AQI 57
Bossier County, Good days share 78.9%
National avg
Share of monitored days at AQI 0-50 (Good band).
Bossier 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
288
79%
Moderate
76
21%
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 Bossier County.
- Ozone · 225 days · 61.6%
- PM2.5 · 136 days · 37.3%
- PM10 · 4 days · 1.1%
Health Impact Assessment
Good
Bossier County's air quality is rated Good based on 78.9% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 78.9% of monitored days in 2025, with a median AQI of 42. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is Ozone, driving AQI on 225 of 365 monitored days.
5-Year Air Quality Trend
Air quality is improving in Bossier County. Highest Good-day share: 2025 (78.9%, 288 of 365 monitored days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 269 | 92 | 1 | 0 | 40 | 105 |
| 2021 | 172 | 193 | 0 | 0 | 51 | 88 |
| 2022 | 162 | 196 | 0 | 0 | 52 | 99 |
| 2023 | 148 | 211 | 1 | 0 | 53 | 114 |
| 2024 | 209 | 152 | 3 | 0 | 47 | 111 |
| 2025 | 288 | 76 | 1 | 0 | 42 | 101 |
How does Bossier County compare?
How Bossier County compares
Good-day share better than typical
Bossier County 78.9%
Ada County, Idaho 74.0%
Typical US county 76.0%
Median AQI worse than typical
Bossier County 42
Ada County, Idaho 42
Typical US county 39
Unhealthy days / yr better than typical
Bossier County 0
Ada County, Idaho 0
Typical US county 1
Counties with a similar median AQI
Nationwide peers within about the same annual median AQI as Bossier County (42), not geographic neighbors.
Ada County, Idaho
Median AQI 42 · 74.0% Good-day share
Adams County, Pennsylvania
Median AQI 42 · 74.4% Good-day share
Allen County, Ohio
Median AQI 42 · 67.0% Good-day share
Asotin County, Washington
Median AQI 42 · 61.9% Good-day share
Baldwin County, Alabama
Median AQI 42 · 75.5% Good-day share
Bell County, Kentucky
Median AQI 42 · 67.0% Good-day share
Same primary pollutant: Ozone
Ozone 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).
Cheshire County, New Hampshire
78.9% Good-day share · median AQI 37
Fayette County, Pennsylvania
78.9% Good-day share · median AQI 40
Sheboygan County, Wisconsin
78.9% Good-day share · median AQI 41
Washington County, Maryland
79.0% Good-day share · median AQI 40
Ocean County, New Jersey
78.8% Good-day share · median AQI 39
Gloucester County, New Jersey
78.7% Good-day share · median AQI 39
Louisiana counties on the map
Geographic containment only, other monitored counties in Louisiana, independent of AQI or pollutant match.
What Bossier County's air means for you
The air here stays in the breathable range year-round, with Ozone the main thing to watch.
- Sensitive groups (asthma, heart conditions, children, older adults) should check the AQI on high-Ozone days, the guide explains what a median of 42 means for exposure. Health guidance
- See how Bossier County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Bossier 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 Bossier County, Louisiana? ▼
Bossier County has a median Air Quality Index (AQI) of 42, rated "Good." 78.9% of monitored days (288 out of 365) had good air quality in 2025.
What is the main pollutant in Bossier County? ▼
The primary pollutant in Bossier County is Ozone (O3), which was the main AQI driver on 225 days (62% of monitored days). Can trigger asthma, reduce lung function, and cause chest pain.
How many unhealthy air days does Bossier County have? ▼
In 2025, Bossier County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 101.
Is the air quality in Bossier County getting better or worse? ▼
Air quality in Bossier 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 78.9% (288 of 365 days). Lowest qualifying Good-day share: 2023 at 41.1% (148 of 360 days).
What does AQI 42 mean for health? ▼
Bossier County's median AQI of 42 falls in the "Good" category. See the AQI category guide for what each range means for health.
How does Bossier County compare to other counties in Louisiana? ▼
Bossier County has 78.9% good air days. Nearby counties in Louisiana: Ascension (95.6% good), Caddo (80.0% good), Calcasieu (62.2% good), East Baton Rouge (49.6% good), Iberville (78.6% good), Jefferson (62.2% good).
What is the 90th percentile AQI in Bossier County? ▼
The 90th percentile AQI for Bossier County is 57, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 101 (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 Bossier 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.