Median AQI
47
Good
Texas · County air quality · 2025
Bell County, Texas
Median AQI 47 (Good). 61.3% of monitored days rated Good, direct from EPA Air Quality System stations.
- 47
- Median AQI
- 61.3%
- Good-air days
- 0
- Unhealthy days
- 17%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Bell County's air is good on balance, among the more polluted 10% of US counties, a median AQI of 47 with 61.3% of 243 monitored days in the Good band, driven mainly by Ozone.
- 47
- median AQI · Good
- 61.3%
- days rated Good
- Ozone
- main pollutant
- 17%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 140.
Data updated July 2026
- Good · 149 d · 61.3%
- Moderate · 90 d · 37.0%
- USG · 4 d · 1.6%
How did Bell County's air break down in 2025?
Across 243 monitored days, 149 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 140 (USG).
EPA AQS →Air quality data from EPA Air Quality System (2025). 243 days monitored. Median AQI: 47 (Good).
Insights: Bell County, Texas. EPA monitors recorded a median Air Quality Index of 47 across 243 measured days in 2025, earning a Good classification and a Moderate health grade. Of those days, 149 (61%) fell in the Good band (AQI 0–50), 90 (37%) registered Moderate readings, and 4 (2%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 65, while the worst single-day peak hit 140 (USG). Residents averaged about 18.4 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as Ozone (140 days), PM2.5 (103 days). Across the 2020–2025 trend window, good days shifted by -87 and the median AQI moved +3 points, placing the multi-year trajectory at worsening. The worst single reading over the 2020–2025 window was AQI 140, usg but never Unhealthy. Nearby counties show comparable readings: Atascosa (58.0% good, AQI 45); Bexar (39.8% good, AQI 53); Bowie (57.3% good, AQI 47); Brazoria (84.8% good, AQI 33); Brazos (63.4% good, AQI 43); Brewster (69.0% good, AQI 44).
Air Quality Summary
Good Days
61.3%
149 of 243 monitored days
-13.7pp vs 75% target
Max AQI Recorded
140
USG
Health Grade
Moderate
90th-pct AQI 65
Bell County, Good days share 61.3%
National avg
Share of monitored days at AQI 0-50 (Good band).
Bell 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 243 monitored days across EPA AQI categories.
Good
149
61%
Moderate
90
37%
USG
4
2%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Pollutant Breakdown
Days where each pollutant was the primary driver of AQI readings in Bell County.
- Ozone · 140 days · 57.6%
- PM2.5 · 103 days · 42.4%
Health Impact Assessment
Moderate
Bell County's air quality is rated Moderate based on 61.3% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 61.3% 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 Ozone, driving AQI on 140 of 243 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Bell County. Best year: 2022 (241 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 236 | 129 | 1 | 0 | 44 | 135 |
| 2021 | 240 | 122 | 3 | 0 | 44 | 122 |
| 2022 | 241 | 121 | 3 | 0 | 46 | 129 |
| 2023 | 231 | 128 | 6 | 0 | 44 | 133 |
| 2024 | 226 | 135 | 5 | 0 | 46 | 129 |
| 2025 | 149 | 90 | 4 | 0 | 47 | 140 |
How does Bell County compare?
How Bell County compares
Good-day share worse than US avg
Bell County 61.3%
Atascosa County, Texas 58.0%
US average 76.5%
Median AQI worse than US avg
Bell County 47
Atascosa County, Texas 45
US average 38
Unhealthy days / yr about average
Bell 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 Bell County.
Beaver County, Pennsylvania
AQI 47 · 54.3% good
Bowie County, Texas
AQI 47 · 57.3% good
Bronx County, New York
AQI 47 · 56.6% good
Butte County, California
AQI 47 · 66.1% good
Calcasieu County, Louisiana
AQI 47 · 61.5% good
Carbon County, Utah
AQI 47 · 62.9% good
What Bell 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 47 means for exposure. Health guidance
- See how Bell County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Bell County with its Texas neighbours before drawing a conclusion about the region. All of Texas
Based on 243 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 Bell County, Texas? ▼
Bell County has a median Air Quality Index (AQI) of 47, rated "Good." 61.3% of monitored days (149 out of 243) had good air quality in 2025.
What is the main pollutant in Bell County? ▼
The primary pollutant in Bell County is Ozone (O3), which was the main AQI driver on 140 days (58% of monitored days). Can trigger asthma, reduce lung function, and cause chest pain.
How many unhealthy air days does Bell County have? ▼
In 2025, Bell County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 140.
Is the air quality in Bell County getting better or worse? ▼
Air quality in Bell County is worsening based on 5-year trends (2020-2025). Best year: 2022 with 241 good days. Worst year: 2025 with 149 good days.
What does AQI 47 mean for health? ▼
Bell County's median AQI of 47 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 Bell County compare to other counties in Texas? ▼
Bell County has 61.3% good air days. Nearby counties in Texas: Atascosa (58.0% good), Bexar (39.8% good), Bowie (57.3% good), Brazoria (84.8% good), Brazos (63.4% good), Brewster (69.0% good).
What is the 90th percentile AQI in Bell County? ▼
The 90th percentile AQI for Bell County is 65, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 140 (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.