Median AQI
31
Good
Texas · County air quality · 2025
Rockwall County, Texas
Median AQI 31 (Good). 95.8% of monitored days rated Good, direct from EPA Air Quality System stations.
- 31
- Median AQI
- 95.8%
- Good-air days
- 0
- Unhealthy days
- 91%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Rockwall County's air is good on balance, among the cleanest 10% of US counties, a median AQI of 31 with 95.8% of 192 monitored days in the Good band, driven mainly by Ozone.
- 31
- median AQI · Good
- 95.8%
- days rated Good
- Ozone
- main pollutant
- 91%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 108.
Data updated July 2026
- Good · 184 d · 95.8%
- Moderate · 6 d · 3.1%
- USG · 2 d · 1.0%
How did Rockwall County's air break down in 2025?
Across 192 monitored days, 184 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 108 (USG).
EPA AQS →Air quality data from EPA Air Quality System (2025). 192 days monitored. Median AQI: 31 (Good).
Insights: Rockwall County, Texas. EPA monitors recorded a median Air Quality Index of 31 across 192 measured days in 2025, earning a Good classification and a Excellent health grade. Of those days, 184 (96%) fell in the Good band (AQI 0–50), 6 (3%) registered Moderate readings, and 2 (1%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 45, while the worst single-day peak hit 108 (USG). Residents averaged about 28.8 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as Ozone (192 days). Across the 2020–2025 trend window, good days shifted by -161 and the median AQI moved -1 points, placing the multi-year trajectory at stable. The worst single reading over the 2020–2025 window was AQI 108, 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
95.8%
184 of 192 monitored days
20.8pp vs 75% target
Max AQI Recorded
108
USG
Health Grade
Excellent
90th-pct AQI 45
Rockwall County, Good days share 95.8%
National avg
Share of monitored days at AQI 0-50 (Good band).
Rockwall 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 192 monitored days across EPA AQI categories.
Good
184
96%
Moderate
6
3%
USG
2
1%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Pollutant Breakdown
Days where each pollutant was the primary driver of AQI readings in Rockwall County.
- Ozone · 192 days · 100.0%
Health Impact Assessment
Excellent
Rockwall County's air quality is rated Excellent based on 95.8% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 95.8% of monitored days in 2025, with a median AQI of 31. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is Ozone, driving AQI on 192 of 192 monitored days.
5-Year Air Quality Trend
Air quality is stable in Rockwall County. Best year: 2020 (345 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 345 | 17 | 1 | 0 | 32 | 133 |
| 2021 | 343 | 17 | 0 | 0 | 31 | 87 |
| 2022 | 339 | 21 | 0 | 0 | 34 | 100 |
| 2023 | 320 | 22 | 0 | 0 | 34 | 100 |
| 2024 | 315 | 23 | 2 | 0 | 34 | 126 |
| 2025 | 184 | 6 | 2 | 0 | 31 | 108 |
How does Rockwall County compare?
How Rockwall County compares
Good-day share better than US avg
Rockwall County 95.8%
Atascosa County, Texas 58.0%
US average 76.5%
Median AQI better than US avg
Rockwall County 31
Atascosa County, Texas 45
US average 38
Unhealthy days / yr about average
Rockwall 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 Rockwall County.
Bannock County, Idaho
AQI 31 · 91.5% good
Clark County, Washington
AQI 31 · 89.3% good
Erie County, Pennsylvania
AQI 31 · 81.4% good
Honolulu County, Hawaii
AQI 31 · 95.0% good
Josephine County, Oregon
AQI 31 · 76.2% good
Monroe County, Wisconsin
AQI 31 · 75.2% good
What Rockwall 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 31 means for exposure. Health guidance
- See how Rockwall County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Rockwall County with its Texas neighbours before drawing a conclusion about the region. All of Texas
Based on 192 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 Rockwall County, Texas? ▼
Rockwall County has a median Air Quality Index (AQI) of 31, rated "Good." 95.8% of monitored days (184 out of 192) had good air quality in 2025.
What is the main pollutant in Rockwall County? ▼
The primary pollutant in Rockwall County is Ozone (O3), which was the main AQI driver on 192 days (100% of monitored days). Can trigger asthma, reduce lung function, and cause chest pain.
How many unhealthy air days does Rockwall County have? ▼
In 2025, Rockwall County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 108.
Is the air quality in Rockwall County getting better or worse? ▼
Air quality in Rockwall County is stable based on 5-year trends (2020-2025). Best year: 2020 with 345 good days. Worst year: 2025 with 184 good days.
What does AQI 31 mean for health? ▼
Rockwall County's median AQI of 31 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 Rockwall County compare to other counties in Texas? ▼
Rockwall County has 95.8% 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 Rockwall County? ▼
The 90th percentile AQI for Rockwall County is 45, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 108 (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.