Median AQI
37
Good
Texas · County air quality · 2025
Hood County, Texas
Median AQI 37 (Good). 87.8% of monitored days rated Good, direct from EPA Air Quality System stations.
- 37
- Median AQI
- 87.8%
- Good-air days
- 0
- Unhealthy days
- 71%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Hood County's air is good on balance, cleaner than the median US county, a median AQI of 37 with 87.8% of 205 monitored days in the Good band, driven mainly by Ozone.
- 37
- median AQI · Good
- 87.8%
- days rated Good
- Ozone
- main pollutant
- 71%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 119.
Data updated July 2026
- Good · 180 d · 87.8%
- Moderate · 24 d · 11.7%
- USG · 1 d · 0.5%
How did Hood County's air break down in 2025?
Across 205 monitored days, 180 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 119 (USG).
EPA AQS →Air quality data from EPA Air Quality System (2025). 205 days monitored. Median AQI: 37 (Good).
Insights: Hood County, Texas. EPA monitors recorded a median Air Quality Index of 37 across 205 measured days in 2025, earning a Good classification and a Good health grade. Of those days, 180 (88%) fell in the Good band (AQI 0–50), 24 (12%) registered Moderate readings, and 1 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 54, while the worst single-day peak hit 119 (USG). Residents averaged about 26.3 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as Ozone (205 days). Across the 2020–2025 trend window, good days shifted by -150 and the median AQI moved +4 points, placing the multi-year trajectory at worsening. The worst single reading over the 2020–2025 window was AQI 119, usg 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
87.8%
180 of 205 monitored days
12.8pp vs 75% target
Max AQI Recorded
119
USG
Health Grade
Good
90th-pct AQI 54
Hood County, Good days share 87.8%
National avg
Share of monitored days at AQI 0-50 (Good band).
Hood 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 205 monitored days across EPA AQI categories.
Good
180
88%
Moderate
24
12%
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 Hood County.
- Ozone · 205 days · 100.0%
Health Impact Assessment
Good
Hood County's air quality is rated Good based on 87.8% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 87.8% of monitored days in 2025, with a median AQI of 37. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is Ozone, driving AQI on 205 of 205 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Hood County. Best year: 2021 (331 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 330 | 27 | 0 | 0 | 33 | 100 |
| 2021 | 331 | 25 | 1 | 0 | 35 | 122 |
| 2022 | 295 | 54 | 11 | 0 | 38 | 150 |
| 2023 | 289 | 61 | 11 | 0 | 39 | 143 |
| 2024 | 274 | 64 | 5 | 1 | 40 | 154 |
| 2025 | 180 | 24 | 1 | 0 | 37 | 119 |
How does Hood County compare?
How Hood County compares
Good-day share better than US avg
Hood County 87.8%
Atascosa County, Texas 58.0%
US average 76.5%
Median AQI better than US avg
Hood County 37
Atascosa County, Texas 45
US average 38
Unhealthy days / yr about average
Hood 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 Hood County.
Alachua County, Florida
AQI 37 · 90.1% good
Beltrami County, Minnesota
AQI 37 · 88.8% good
Benewah County, Idaho
AQI 37 · 74.6% good
Brevard County, Florida
AQI 37 · 89.7% good
Brown County, Indiana
AQI 37 · 94.5% good
Brown County, Wisconsin
AQI 37 · 79.0% good
What Hood 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 37 means for exposure. Health guidance
- See how Hood County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Hood County with its Texas neighbours before drawing a conclusion about the region. All of Texas
Based on 205 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 Hood County, Texas? ▼
Hood County has a median Air Quality Index (AQI) of 37, rated "Good." 87.8% of monitored days (180 out of 205) had good air quality in 2025.
What is the main pollutant in Hood County? ▼
The primary pollutant in Hood County is Ozone (O3), which was the main AQI driver on 205 days (100% of monitored days). Can trigger asthma, reduce lung function, and cause chest pain.
How many unhealthy air days does Hood County have? ▼
In 2025, Hood County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 119.
Is the air quality in Hood County getting better or worse? ▼
Air quality in Hood County is worsening based on 5-year trends (2020-2025). Best year: 2021 with 331 good days. Worst year: 2025 with 180 good days.
What does AQI 37 mean for health? ▼
Hood County's median AQI of 37 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 Hood County compare to other counties in Texas? ▼
Hood County has 87.8% 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 Hood County? ▼
The 90th percentile AQI for Hood County is 54, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 119 (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.