Median AQI
39
Good
Pennsylvania · County air quality · 2025
Bradford County, Pennsylvania
Median AQI 39 (Good). 77.4% of monitored days rated Good, direct from EPA Air Quality System stations.
- 39
- Median AQI
- 77.4%
- Good-air days
- 0
- Unhealthy days
- 45%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Bradford County's air is good on balance, more polluted than the median US county, a median AQI of 39 with 77.4% of 199 monitored days in the Good band, driven mainly by Ozone.
- 39
- median AQI · Good
- 77.4%
- days rated Good
- Ozone
- main pollutant
- 45%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 87.
Data updated July 2026
- Good · 154 d · 77.4%
- Moderate · 45 d · 22.6%
How did Bradford County's air break down in 2025?
Across 199 monitored days, 154 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 87 (Moderate).
EPA AQS →Air quality data from EPA Air Quality System (2025). 199 days monitored. Median AQI: 39 (Good).
Insights: Bradford County, Pennsylvania. EPA monitors recorded a median Air Quality Index of 39 across 199 measured days in 2025, earning a Good classification and a Good health grade. Of those days, 154 (77%) fell in the Good band (AQI 0–50), 45 (23%) registered Moderate readings, and 0 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 56, while the worst single-day peak hit 87 (Moderate). Residents averaged about 23.2 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as Ozone (116 days), PM2.5 (81 days), NO2 (2 days). Across the 2020–2025 trend window, good days shifted by -147 and the median AQI moved +0 points, placing the multi-year trajectory at worsening. The worst single reading over the 2020–2025 window was AQI 87, moderate but never Unhealthy. Nearby counties show comparable readings: Adams (73.8% good, AQI 42); Allegheny (51.6% good, AQI 49); Armstrong (68.1% good, AQI 42); Beaver (54.3% good, AQI 47); Berks (65.6% good, AQI 44); Blair (71.9% good, AQI 41).
Air Quality Summary
Good Days
77.4%
154 of 199 monitored days
2.4pp vs 75% target
Max AQI Recorded
87
Moderate
Health Grade
Good
90th-pct AQI 56
Bradford County, Good days share 77.4%
National avg
Share of monitored days at AQI 0-50 (Good band).
Bradford 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 199 monitored days across EPA AQI categories.
Good
154
77%
Moderate
45
23%
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 Bradford County.
- Ozone · 116 days · 58.3%
- PM2.5 · 81 days · 40.7%
- NO₂ · 2 days · 1.0%
Health Impact Assessment
Good
Bradford County's air quality is rated Good based on 77.4% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 77.4% of monitored days in 2025, with a median AQI of 39. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is Ozone, driving AQI on 116 of 199 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Bradford County. Best year: 2020 (301 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 301 | 57 | 0 | 0 | 39 | 84 |
| 2021 | 242 | 113 | 1 | 0 | 42 | 116 |
| 2022 | 246 | 57 | 0 | 0 | 40 | 80 |
| 2023 | 237 | 51 | 1 | 0 | 40 | 108 |
| 2024 | 298 | 65 | 0 | 0 | 37 | 75 |
| 2025 | 154 | 45 | 0 | 0 | 39 | 87 |
How does Bradford County compare?
How Bradford County compares
Good-day share better than US avg
Bradford County 77.4%
Adams County, Pennsylvania 73.8%
US average 76.5%
Median AQI worse than US avg
Bradford County 39
Adams County, Pennsylvania 42
US average 38
Unhealthy days / yr about average
Bradford County 0
Adams County, Pennsylvania 0
US average 0
Other Counties in Pennsylvania
Air quality comparison for nearby counties in Pennsylvania.
Counties with Similar Air Quality
Counties across the US with a similar median AQI to Bradford County.
Ada County, Idaho
AQI 39 · 80.6% good
Aiken County, South Carolina
AQI 39 · 89.1% good
Albany County, New York
AQI 39 · 67.4% good
Alexander County, North Carolina
AQI 39 · 92.4% good
Ashland County, Wisconsin
AQI 39 · 85.6% good
Bennington County, Vermont
AQI 39 · 82.9% good
What Bradford 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 39 means for exposure. Health guidance
- See how Bradford County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Bradford County with its Pennsylvania neighbours before drawing a conclusion about the region. All of Pennsylvania
Based on 199 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 Bradford County, Pennsylvania? ▼
Bradford County has a median Air Quality Index (AQI) of 39, rated "Good." 77.4% of monitored days (154 out of 199) had good air quality in 2025.
What is the main pollutant in Bradford County? ▼
The primary pollutant in Bradford County is Ozone (O3), which was the main AQI driver on 116 days (58% of monitored days). Can trigger asthma, reduce lung function, and cause chest pain.
How many unhealthy air days does Bradford County have? ▼
In 2025, Bradford County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 87.
Is the air quality in Bradford County getting better or worse? ▼
Air quality in Bradford County is worsening based on 5-year trends (2020-2025). Best year: 2020 with 301 good days. Worst year: 2025 with 154 good days.
What does AQI 39 mean for health? ▼
Bradford County's median AQI of 39 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 Bradford County compare to other counties in Pennsylvania? ▼
Bradford County has 77.4% good air days. Nearby counties in Pennsylvania: Adams (73.8% good), Allegheny (51.6% good), Armstrong (68.1% good), Beaver (54.3% good), Berks (65.6% good), Blair (71.9% good).
What is the 90th percentile AQI in Bradford County? ▼
The 90th percentile AQI for Bradford County is 56, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 87 (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.