Median AQI
36
Good
Texas · County air quality · 2025
Parker County, Texas
Median AQI 36 (Good). 88.5% of monitored days rated Good, direct from EPA Air Quality System stations.
- 36
- Median AQI
- 88.5%
- Good-air days
- 0
- Unhealthy days
- 72%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Parker County's air is good on balance, cleaner than the median US county, a median AQI of 36 with 88.5% of 200 monitored days in the Good band, driven mainly by Ozone.
- 36
- median AQI · Good
- 88.5%
- days rated Good
- Ozone
- main pollutant
- 72%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 93.
Data updated July 2026
- Good · 177 d · 88.5%
- Moderate · 23 d · 11.5%
How did Parker County's air break down in 2025?
Across 200 monitored days, 177 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 93 (Moderate).
EPA AQS →Air quality data from EPA Air Quality System (2025). 200 days monitored. Median AQI: 36 (Good).
Insights: Parker County, Texas. EPA monitors recorded a median Air Quality Index of 36 across 200 measured days in 2025, earning a Good classification and a Good health grade. Of those days, 177 (89%) fell in the Good band (AQI 0–50), 23 (12%) registered Moderate readings, and 0 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 51, while the worst single-day peak hit 93 (Moderate). Residents averaged about 26.6 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as Ozone (200 days). Across the 2020–2025 trend window, good days shifted by -154 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 93, 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
88.5%
177 of 200 monitored days
13.5pp vs 75% target
Max AQI Recorded
93
Moderate
Health Grade
Good
90th-pct AQI 51
Parker County, Good days share 88.5%
National avg
Share of monitored days at AQI 0-50 (Good band).
Parker 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 200 monitored days across EPA AQI categories.
Good
177
89%
Moderate
23
12%
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 Parker County.
- Ozone · 200 days · 100.0%
Health Impact Assessment
Good
Parker County's air quality is rated Good based on 88.5% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 88.5% of monitored days in 2025, with a median AQI of 36. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is Ozone, driving AQI on 200 of 200 monitored days.
5-Year Air Quality Trend
Air quality is stable in Parker County. Best year: 2020 (331 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 331 | 30 | 1 | 0 | 35 | 115 |
| 2021 | 312 | 41 | 1 | 0 | 36 | 136 |
| 2022 | 290 | 54 | 14 | 0 | 40 | 147 |
| 2023 | 301 | 50 | 7 | 0 | 39 | 140 |
| 2024 | 299 | 44 | 5 | 1 | 36 | 156 |
| 2025 | 177 | 23 | 0 | 0 | 36 | 93 |
How does Parker County compare?
How Parker County compares
Good-day share better than US avg
Parker County 88.5%
Atascosa County, Texas 58.0%
US average 76.5%
Median AQI better than US avg
Parker County 36
Atascosa County, Texas 45
US average 38
Unhealthy days / yr about average
Parker 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 Parker County.
Aroostook County, Maine
AQI 36 · 84.1% good
Berkeley County, South Carolina
AQI 36 · 92.2% good
Carter County, Kentucky
AQI 36 · 89.8% good
Claiborne County, Tennessee
AQI 36 · 96.3% good
Clark County, Illinois
AQI 36 · 92.1% good
Cobb County, Georgia
AQI 36 · 92.5% good
What Parker 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 36 means for exposure. Health guidance
- See how Parker County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Parker County with its Texas neighbours before drawing a conclusion about the region. All of Texas
Based on 200 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 Parker County, Texas? ▼
Parker County has a median Air Quality Index (AQI) of 36, rated "Good." 88.5% of monitored days (177 out of 200) had good air quality in 2025.
What is the main pollutant in Parker County? ▼
The primary pollutant in Parker County is Ozone (O3), which was the main AQI driver on 200 days (100% of monitored days). Can trigger asthma, reduce lung function, and cause chest pain.
How many unhealthy air days does Parker County have? ▼
In 2025, Parker County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 93.
Is the air quality in Parker County getting better or worse? ▼
Air quality in Parker County is stable based on 5-year trends (2020-2025). Best year: 2020 with 331 good days. Worst year: 2025 with 177 good days.
What does AQI 36 mean for health? ▼
Parker County's median AQI of 36 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 Parker County compare to other counties in Texas? ▼
Parker County has 88.5% 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 Parker County? ▼
The 90th percentile AQI for Parker County is 51, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 93 (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.