Median AQI
40
Good
Virginia · County air quality · 2025
Wythe County, Virginia
Median AQI 40 (Good). 93.3% of monitored days rated Good, direct from EPA Air Quality System stations.
- 40
- Median AQI
- 93.3%
- Good-air days
- 0
- Unhealthy days
- 84%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Wythe County's air is good on balance, cleaner than most US counties, a median AQI of 40 with 93.3% of 208 monitored days in the Good band, driven mainly by Ozone.
- 40
- median AQI · Good
- 93.3%
- days rated Good
- Ozone
- main pollutant
- 84%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 77.
Data updated July 2026
- Good · 194 d · 93.3%
- Moderate · 14 d · 6.7%
How did Wythe County's air break down in 2025?
Across 208 monitored days, 194 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 77 (Moderate).
EPA AQS →Air quality data from EPA Air Quality System (2025). 208 days monitored. Median AQI: 40 (Good).
Insights: Wythe County, Virginia. EPA monitors recorded a median Air Quality Index of 40 across 208 measured days in 2025, earning a Good classification and a Excellent health grade. Of those days, 194 (93%) fell in the Good band (AQI 0–50), 14 (7%) registered Moderate readings, and 0 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 48, while the worst single-day peak hit 77 (Moderate). Residents averaged about 28.0 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as Ozone (208 days). Across the 2020–2025 trend window, good days shifted by -39 and the median AQI moved +6 points, placing the multi-year trajectory at worsening. The worst single reading over the 2020–2025 window was AQI 77, moderate but never Unhealthy. Nearby counties show comparable readings: Albemarle (77.9% good, AQI 41); Arlington (84.8% good, AQI 40); Bristol City (78.3% good, AQI 33); Caroline (96.2% good, AQI 37); Carroll (100.0% good, AQI 9); Charles (88.6% good, AQI 38).
Air Quality Summary
Good Days
93.3%
194 of 208 monitored days
18.3pp vs 75% target
Max AQI Recorded
77
Moderate
Health Grade
Excellent
90th-pct AQI 48
Wythe County, Good days share 93.3%
National avg
Share of monitored days at AQI 0-50 (Good band).
Wythe 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 208 monitored days across EPA AQI categories.
Good
194
93%
Moderate
14
7%
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 Wythe County.
- Ozone · 208 days · 100.0%
Health Impact Assessment
Excellent
Wythe County's air quality is rated Excellent based on 93.3% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 93.3% of monitored days in 2025, with a median AQI of 40. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is Ozone, driving AQI on 208 of 208 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Wythe County. Best year: 2024 (236 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 233 | 2 | 0 | 0 | 34 | 61 |
| 2021 | 228 | 14 | 0 | 0 | 39 | 71 |
| 2022 | 232 | 13 | 0 | 0 | 39 | 77 |
| 2023 | 224 | 20 | 0 | 0 | 40 | 87 |
| 2024 | 236 | 9 | 0 | 0 | 41 | 67 |
| 2025 | 194 | 14 | 0 | 0 | 40 | 77 |
How does Wythe County compare?
How Wythe County compares
Good-day share better than US avg
Wythe County 93.3%
Albemarle County, Virginia 77.9%
US average 76.5%
Median AQI worse than US avg
Wythe County 40
Albemarle County, Virginia 41
US average 38
Unhealthy days / yr about average
Wythe County 0
Albemarle County, Virginia 0
US average 0
Other Counties in Virginia
Air quality comparison for nearby counties in Virginia.
Counties with Similar Air Quality
Counties across the US with a similar median AQI to Wythe County.
Amador County, California
AQI 40 · 84.8% good
Anne Arundel County, Maryland
AQI 40 · 87.2% good
Arlington County, Virginia
AQI 40 · 84.8% good
Bergen County, New Jersey
AQI 40 · 71.1% good
Berkeley County, West Virginia
AQI 40 · 81.1% good
Billings County, North Dakota
AQI 40 · 80.3% good
What Wythe 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 40 means for exposure. Health guidance
- See how Wythe County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Wythe County with its Virginia neighbours before drawing a conclusion about the region. All of Virginia
Based on 208 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 Wythe County, Virginia? ▼
Wythe County has a median Air Quality Index (AQI) of 40, rated "Good." 93.3% of monitored days (194 out of 208) had good air quality in 2025.
What is the main pollutant in Wythe County? ▼
The primary pollutant in Wythe County is Ozone (O3), which was the main AQI driver on 208 days (100% of monitored days). Can trigger asthma, reduce lung function, and cause chest pain.
How many unhealthy air days does Wythe County have? ▼
In 2025, Wythe County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 77.
Is the air quality in Wythe County getting better or worse? ▼
Air quality in Wythe County is worsening based on 5-year trends (2020-2025). Best year: 2024 with 236 good days. Worst year: 2025 with 194 good days.
What does AQI 40 mean for health? ▼
Wythe County's median AQI of 40 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 Wythe County compare to other counties in Virginia? ▼
Wythe County has 93.3% good air days. Nearby counties in Virginia: Albemarle (77.9% good), Arlington (84.8% good), Bristol City (78.3% good), Caroline (96.2% good), Carroll (100.0% good), Charles (88.6% good).
What is the 90th percentile AQI in Wythe County? ▼
The 90th percentile AQI for Wythe County is 48, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 77 (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.