Median AQI
37
Good
Nebraska · County air quality · 2025
Hall County, Nebraska
Median AQI 37 (Good). 80.2% of monitored days rated Good, direct from EPA Air Quality System stations.
- 37
- Median AQI
- 80.2%
- Good-air days
- 0
- Unhealthy days
- 53%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Hall County's air is good on balance, cleaner than the median US county, a median AQI of 37 with 80.2% of 283 monitored days in the Good band, driven mainly by PM2.5.
- 37
- median AQI · Good
- 80.2%
- days rated Good
- PM2.5
- main pollutant
- 53%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 118.
Data updated July 2026
- Good · 227 d · 80.2%
- Moderate · 54 d · 19.1%
- USG · 2 d · 0.7%
How did Hall County's air break down in 2025?
Across 283 monitored days, 227 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 118 (USG).
EPA AQS →Air quality data from EPA Air Quality System (2025). 283 days monitored. Median AQI: 37 (Good).
Insights: Hall County, Nebraska. EPA monitors recorded a median Air Quality Index of 37 across 283 measured days in 2025, earning a Good classification and a Good health grade. Of those days, 227 (80%) fell in the Good band (AQI 0–50), 54 (19%) registered Moderate readings, and 2 (1%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 54, while the worst single-day peak hit 118 (USG). Residents averaged about 24.1 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as PM2.5 (161 days), Ozone (122 days). Across the 2020–2025 trend window, good days shifted by -69 and the median AQI moved +11 points, placing the multi-year trajectory at worsening. The worst single reading over the 2020–2025 window was AQI 118, usg but never Unhealthy. Nearby counties show comparable readings: Cass (96.5% good, AQI 20); Douglas (66.8% good, AQI 44); Gage (74.0% good, AQI 36); Knox (89.3% good, AQI 39); Lancaster (77.7% good, AQI 36); Sarpy (77.1% good, AQI 33).
Air Quality Summary
Good Days
80.2%
227 of 283 monitored days
5.2pp vs 75% target
Max AQI Recorded
118
USG
Health Grade
Good
90th-pct AQI 54
Hall County, Good days share 80.2%
National avg
Share of monitored days at AQI 0-50 (Good band).
Hall 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 283 monitored days across EPA AQI categories.
Good
227
80%
Moderate
54
19%
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 Hall County.
- PM2.5 · 161 days · 56.9%
- Ozone · 122 days · 43.1%
Health Impact Assessment
Good
Hall County's air quality is rated Good based on 80.2% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 80.2% of monitored days in 2025, with a median AQI of 37. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is PM2.5, driving AQI on 161 of 283 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Hall County. Best year: 2022 (301 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 296 | 42 | 0 | 0 | 26 | 87 |
| 2021 | 268 | 87 | 2 | 0 | 34 | 134 |
| 2022 | 301 | 49 | 0 | 0 | 27 | 84 |
| 2023 | 251 | 88 | 0 | 3 | 35 | 190 |
| 2024 | 248 | 75 | 0 | 0 | 32 | 80 |
| 2025 | 227 | 54 | 2 | 0 | 37 | 118 |
How does Hall County compare?
How Hall County compares
Good-day share better than US avg
Hall County 80.2%
Cass County, Nebraska 96.5%
US average 76.5%
Median AQI better than US avg
Hall County 37
Cass County, Nebraska 20
US average 38
Unhealthy days / yr about average
Hall County 0
Cass County, Nebraska 0
US average 0
Other Counties in Nebraska
Air quality comparison for nearby counties in Nebraska.
Counties with Similar Air Quality
Counties across the US with a similar median AQI to Hall County.
Alachua County, Florida
AQI 37 · 90.1% good
Beltrami County, Minnesota
AQI 37 · 88.8% good
Benewah County, Idaho
AQI 37 · 74.6% good
Brevard County, Florida
AQI 37 · 89.7% good
Brown County, Indiana
AQI 37 · 94.5% good
Brown County, Wisconsin
AQI 37 · 79.0% good
What Hall 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 37 means for exposure. Health guidance
- See how Hall County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Hall County with its Nebraska neighbours before drawing a conclusion about the region. All of Nebraska
Based on 283 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 Hall County, Nebraska? ▼
Hall County has a median Air Quality Index (AQI) of 37, rated "Good." 80.2% of monitored days (227 out of 283) had good air quality in 2025.
What is the main pollutant in Hall County? ▼
The primary pollutant in Hall County is Fine Particles (PM2.5), which was the main AQI driver on 161 days (57% of monitored days). Penetrates deep into lungs and bloodstream. Linked to heart disease and premature death.
How many unhealthy air days does Hall County have? ▼
In 2025, Hall County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 118.
Is the air quality in Hall County getting better or worse? ▼
Air quality in Hall County is worsening based on 5-year trends (2020-2025). Best year: 2022 with 301 good days. Worst year: 2025 with 227 good days.
What does AQI 37 mean for health? ▼
Hall County's median AQI of 37 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 Hall County compare to other counties in Nebraska? ▼
Hall County has 80.2% good air days. Nearby counties in Nebraska: Cass (96.5% good), Douglas (66.8% good), Gage (74.0% good), Knox (89.3% good), Lancaster (77.7% good), Sarpy (77.1% good).
What is the 90th percentile AQI in Hall County? ▼
The 90th percentile AQI for Hall County is 54, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 118 (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.