Median AQI
26
Good
Pennsylvania · County air quality · 2025
Wyoming County, Pennsylvania
Median AQI 26 (Good). 83.1% of monitored days rated Good, direct from EPA Air Quality System stations.
- 26
- Median AQI
- 83.1%
- Good-air days
- 0
- Unhealthy days
- 60%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Wyoming County's air is good on balance, cleaner than the median US county, a median AQI of 26 with 83.1% of 207 monitored days in the Good band, driven mainly by PM2.5.
- 26
- median AQI · Good
- 83.1%
- days rated Good
- PM2.5
- main pollutant
- 60%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 79.
Data updated July 2026
- Good · 172 d · 83.1%
- Moderate · 35 d · 16.9%
How did Wyoming County's air break down in 2025?
Across 207 monitored days, 172 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 79 (Moderate).
EPA AQS →Air quality data from EPA Air Quality System (2025). 207 days monitored. Median AQI: 26 (Good).
Insights: Wyoming County, Pennsylvania. EPA monitors recorded a median Air Quality Index of 26 across 207 measured days in 2025, earning a Good classification and a Good health grade. Of those days, 172 (83%) fell in the Good band (AQI 0–50), 35 (17%) registered Moderate readings, and 0 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 54, while the worst single-day peak hit 79 (Moderate). Residents averaged about 24.9 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as PM2.5 (207 days). Across the 2020–2025 trend window, good days shifted by -128 and the median AQI moved -7 points, placing the multi-year trajectory at improving. The worst single reading over the 2020–2025 window was AQI 79, 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
83.1%
172 of 207 monitored days
8.1pp vs 75% target
Max AQI Recorded
79
Moderate
Health Grade
Good
90th-pct AQI 54
Wyoming County, Good days share 83.1%
National avg
Share of monitored days at AQI 0-50 (Good band).
Wyoming 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 207 monitored days across EPA AQI categories.
Good
172
83%
Moderate
35
17%
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 Wyoming County.
- PM2.5 · 207 days · 100.0%
Health Impact Assessment
Good
Wyoming County's air quality is rated Good based on 83.1% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 83.1% of monitored days in 2025, with a median AQI of 26. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is PM2.5, driving AQI on 207 of 207 monitored days.
5-Year Air Quality Trend
Air quality is improving in Wyoming County. Best year: 2024 (319 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 300 | 61 | 0 | 0 | 33 | 79 |
| 2021 | 254 | 81 | 1 | 0 | 34 | 127 |
| 2022 | 219 | 51 | 0 | 0 | 34 | 65 |
| 2023 | 123 | 23 | 0 | 0 | 27 | 68 |
| 2024 | 319 | 33 | 0 | 0 | 26 | 68 |
| 2025 | 172 | 35 | 0 | 0 | 26 | 79 |
How does Wyoming County compare?
How Wyoming County compares
Good-day share better than US avg
Wyoming County 83.1%
Adams County, Pennsylvania 73.8%
US average 76.5%
Median AQI better than US avg
Wyoming County 26
Adams County, Pennsylvania 42
US average 38
Unhealthy days / yr about average
Wyoming 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 Wyoming County.
Clallam County, Washington
AQI 26 · 88.5% good
Ford County, Kansas
AQI 26 · 89.4% good
Grant County, Washington
AQI 26 · 89.7% good
Harney County, Oregon
AQI 26 · 70.7% good
Taney County, Missouri
AQI 26 · 100.0% good
Thurston County, Washington
AQI 26 · 98.1% good
What Wyoming County's air means for you
The air here stays in the breathable range year-round, with PM2.5 the main thing to watch.
- Sensitive groups (asthma, heart conditions, children, older adults) should check the AQI on high-PM2.5 days, the guide explains what a median of 26 means for exposure. Health guidance
- See how Wyoming County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Wyoming County with its Pennsylvania neighbours before drawing a conclusion about the region. All of Pennsylvania
Based on 207 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 Wyoming County, Pennsylvania? ▼
Wyoming County has a median Air Quality Index (AQI) of 26, rated "Good." 83.1% of monitored days (172 out of 207) had good air quality in 2025.
What is the main pollutant in Wyoming County? ▼
The primary pollutant in Wyoming County is Fine Particles (PM2.5), which was the main AQI driver on 207 days (100% of monitored days). Penetrates deep into lungs and bloodstream. Linked to heart disease and premature death.
How many unhealthy air days does Wyoming County have? ▼
In 2025, Wyoming County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 79.
Is the air quality in Wyoming County getting better or worse? ▼
Air quality in Wyoming County is improving based on 5-year trends (2020-2025). Best year: 2024 with 319 good days. Worst year: 2023 with 123 good days.
What does AQI 26 mean for health? ▼
Wyoming County's median AQI of 26 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 Wyoming County compare to other counties in Pennsylvania? ▼
Wyoming County has 83.1% 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 Wyoming County? ▼
The 90th percentile AQI for Wyoming County is 54, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 79 (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.