Median AQI
24
Good
Texas · County air quality · 2025
Culberson County, Texas
Median AQI 24 (Good). 80.0% of monitored days rated Good, direct from EPA Air Quality System stations.
- 24
- Median AQI
- 80.0%
- Good-air days
- 0
- Unhealthy days
- 52%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Culberson County's air is good on balance, cleaner than the median US county, a median AQI of 24 with 80.0% of 20 monitored days in the Good band, driven mainly by PM2.5.
- 24
- median AQI · Good
- 80.0%
- days rated Good
- PM2.5
- main pollutant
- 52%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 75.
Data updated July 2026
- Good · 16 d · 80.0%
- Moderate · 4 d · 20.0%
How did Culberson County's air break down in 2025?
Across 20 monitored days, 16 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 75 (Moderate).
EPA AQS →Air quality data from EPA Air Quality System (2025). 20 days monitored. Median AQI: 24 (Good).
Insights: Culberson County, Texas. EPA monitors recorded a median Air Quality Index of 24 across 20 measured days in 2025, earning a Good classification and a Good health grade. Of those days, 16 (80%) fell in the Good band (AQI 0–50), 4 (20%) registered Moderate readings, and 0 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 67, while the worst single-day peak hit 75 (Moderate). Residents averaged about 24.0 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as PM2.5 (20 days). Across the 2020–2025 trend window, good days shifted by -109 and the median AQI moved -22 points, placing the multi-year trajectory at improving. The worst single reading over the 2020–2025 window was AQI 75, moderate but never Unhealthy. Nearby counties show comparable readings: Atascosa (58.0% good, AQI 45); Bell (61.3% good, AQI 47); Bexar (39.8% good, AQI 53); Bowie (57.3% good, AQI 47); Brazoria (84.8% good, AQI 33); Brazos (63.4% good, AQI 43).
Air Quality Summary
Good Days
80.0%
16 of 20 monitored days
5.0pp vs 75% target
Max AQI Recorded
75
Moderate
Health Grade
Good
90th-pct AQI 67
Culberson County, Good days share 80.0%
National avg
Share of monitored days at AQI 0-50 (Good band).
Culberson 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 20 monitored days across EPA AQI categories.
Good
16
80%
Moderate
4
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 Culberson County.
- PM2.5 · 20 days · 100.0%
Health Impact Assessment
Good
Culberson County's air quality is rated Good based on 80.0% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 80.0% of monitored days in 2025, with a median AQI of 24. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is PM2.5, driving AQI on 20 of 20 monitored days.
5-Year Air Quality Trend
Air quality is improving in Culberson County. Best year: 2021 (170 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 125 | 69 | 7 | 0 | 46 | 112 |
| 2021 | 170 | 47 | 4 | 0 | 43 | 126 |
| 2022 | 111 | 60 | 4 | 0 | 41 | 119 |
| 2023 | 101 | 6 | 0 | 0 | 20 | 89 |
| 2024 | 99 | 12 | 0 | 0 | 26 | 88 |
| 2025 | 16 | 4 | 0 | 0 | 24 | 75 |
How does Culberson County compare?
How Culberson County compares
Good-day share better than US avg
Culberson County 80.0%
Atascosa County, Texas 58.0%
US average 76.5%
Median AQI better than US avg
Culberson County 24
Atascosa County, Texas 45
US average 38
Unhealthy days / yr about average
Culberson County 0
Atascosa County, Texas 0
US average 0
Other Counties in Texas
Air quality comparison for nearby counties in Texas.
Counties with Similar Air Quality
Counties across the US with a similar median AQI to Culberson County.
Alamosa County, Colorado
AQI 24 · 90.8% good
Anchorage County, Alaska
AQI 24 · 80.8% good
Charlton County, Georgia
AQI 24 · 79.0% good
Crook County, Oregon
AQI 24 · 80.7% good
Kootenai County, Idaho
AQI 24 · 88.4% good
Lake County, Oregon
AQI 24 · 82.8% good
What Culberson 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 24 means for exposure. Health guidance
- See how Culberson County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Culberson County with its Texas neighbours before drawing a conclusion about the region. All of Texas
Based on 20 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 Culberson County, Texas? ▼
Culberson County has a median Air Quality Index (AQI) of 24, rated "Good." 80.0% of monitored days (16 out of 20) had good air quality in 2025.
What is the main pollutant in Culberson County? ▼
The primary pollutant in Culberson County is Fine Particles (PM2.5), which was the main AQI driver on 20 days (100% of monitored days). Penetrates deep into lungs and bloodstream. Linked to heart disease and premature death.
How many unhealthy air days does Culberson County have? ▼
In 2025, Culberson County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 75.
Is the air quality in Culberson County getting better or worse? ▼
Air quality in Culberson County is improving based on 5-year trends (2020-2025). Best year: 2021 with 170 good days. Worst year: 2025 with 16 good days.
What does AQI 24 mean for health? ▼
Culberson County's median AQI of 24 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 Culberson County compare to other counties in Texas? ▼
Culberson County has 80.0% good air days. Nearby counties in Texas: Atascosa (58.0% good), Bell (61.3% good), Bexar (39.8% good), Bowie (57.3% good), Brazoria (84.8% good), Brazos (63.4% good).
What is the 90th percentile AQI in Culberson County? ▼
The 90th percentile AQI for Culberson County is 67, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 75 (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.