Median AQI
44
Good
Pennsylvania · County air quality · 2025
Lebanon County, Pennsylvania
Median AQI 44 (Good). 62.3% of monitored days rated Good, direct from EPA Air Quality System stations.
- 44
- Median AQI
- 62.3%
- Good-air days
- 0
- Unhealthy days
- 19%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Lebanon County's air is good on balance, among the more polluted 10% of US counties, a median AQI of 44 with 62.3% of 212 monitored days in the Good band, driven mainly by PM2.5.
- 44
- median AQI · Good
- 62.3%
- days rated Good
- PM2.5
- main pollutant
- 19%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 108.
Data updated July 2026
- Good · 132 d · 62.3%
- Moderate · 78 d · 36.8%
- USG · 2 d · 0.9%
How did Lebanon County's air break down in 2025?
Across 212 monitored days, 132 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). 212 days monitored. Median AQI: 44 (Good).
Insights: Lebanon County, Pennsylvania. EPA monitors recorded a median Air Quality Index of 44 across 212 measured days in 2025, earning a Good classification and a Moderate health grade. Of those days, 132 (62%) fell in the Good band (AQI 0–50), 78 (37%) registered Moderate readings, and 2 (1%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 65, while the worst single-day peak hit 108 (USG). Residents averaged about 18.7 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as PM2.5 (115 days), Ozone (97 days). Across the 2020–2025 trend window, good days shifted by +16 and the median AQI moved +3 points, placing the multi-year trajectory at worsening. The worst single reading over the 2020–2025 window was AQI 108, usg 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
62.3%
132 of 212 monitored days
-12.7pp vs 75% target
Max AQI Recorded
108
USG
Health Grade
Moderate
90th-pct AQI 65
Lebanon County, Good days share 62.3%
National avg
Share of monitored days at AQI 0-50 (Good band).
Lebanon 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 212 monitored days across EPA AQI categories.
Good
132
62%
Moderate
78
37%
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 Lebanon County.
- PM2.5 · 115 days · 54.2%
- Ozone · 97 days · 45.8%
Health Impact Assessment
Moderate
Lebanon County's air quality is rated Moderate based on 62.3% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 62.3% of monitored days in 2025, with a median AQI of 44. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is PM2.5, driving AQI on 115 of 212 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Lebanon County. Best year: 2024 (242 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 116 | 53 | 1 | 0 | 41 | 115 |
| 2021 | 197 | 166 | 2 | 0 | 49 | 117 |
| 2022 | 224 | 138 | 2 | 0 | 46 | 108 |
| 2023 | 204 | 151 | 5 | 3 | 47 | 265 |
| 2024 | 242 | 122 | 2 | 0 | 43 | 108 |
| 2025 | 132 | 78 | 2 | 0 | 44 | 108 |
How does Lebanon County compare?
How Lebanon County compares
Good-day share worse than US avg
Lebanon County 62.3%
Adams County, Pennsylvania 73.8%
US average 76.5%
Median AQI worse than US avg
Lebanon County 44
Adams County, Pennsylvania 42
US average 38
Unhealthy days / yr about average
Lebanon 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 Lebanon County.
Baltimore County, Maryland
AQI 44 · 70.4% good
Baltimore (City) County, Maryland
AQI 44 · 68.7% good
Bartholomew County, Indiana
AQI 44 · 69.2% good
Berks County, Pennsylvania
AQI 44 · 65.6% good
Bolivar County, Mississippi
AQI 44 · 70.3% good
Brewster County, Texas
AQI 44 · 69.0% good
What Lebanon 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 44 means for exposure. Health guidance
- See how Lebanon County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Lebanon County with its Pennsylvania neighbours before drawing a conclusion about the region. All of Pennsylvania
Based on 212 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 Lebanon County, Pennsylvania? ▼
Lebanon County has a median Air Quality Index (AQI) of 44, rated "Good." 62.3% of monitored days (132 out of 212) had good air quality in 2025.
What is the main pollutant in Lebanon County? ▼
The primary pollutant in Lebanon County is Fine Particles (PM2.5), which was the main AQI driver on 115 days (54% of monitored days). Penetrates deep into lungs and bloodstream. Linked to heart disease and premature death.
How many unhealthy air days does Lebanon County have? ▼
In 2025, Lebanon County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 108.
Is the air quality in Lebanon County getting better or worse? ▼
Air quality in Lebanon County is worsening based on 5-year trends (2020-2025). Best year: 2024 with 242 good days. Worst year: 2020 with 116 good days.
What does AQI 44 mean for health? ▼
Lebanon County's median AQI of 44 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 Lebanon County compare to other counties in Pennsylvania? ▼
Lebanon County has 62.3% 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 Lebanon County? ▼
The 90th percentile AQI for Lebanon County is 65, 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.