State air quality · 2025
Virgin Islands Air Quality Ranking
Across 1 monitored counties, the typical county in Virgin Islands posts a median AQI of 21 (Good) and 89.3% of monitored days were rated Good, from EPA AQS.
- 21
- Avg median AQI
- 89.3%
- Good-air days
- 1
- Counties monitored
Virgin Islands's typical county median AQI is 21 (Good) across 1 monitored counties
According to the U.S. EPA Air Quality System, Virgin Islands monitors 1 counties with a day-weighted Good-day share of 89.3%. Cleanest: St John County (89.3% Good). Most polluted: St John County (89.3%). These are annual summaries, not live AirNow readings.
Data source EPA Air Quality System (AQS)
- In-state spread
- Within Virgin Islands, St John County leads at 89.3% Good days while St John County sits at 89.3% across 1 monitored counties.
- 2024→2025 release
- Virgin Islands's Good-day share moved +4.4 points vs the 2024 EPA annual release.
- Typical median AQI
- Typical median AQI: 21
- Good-day share
- Good-day share: 89.3%
Verify with AirNow → · EPA AQS →
EPA state monitoring brief
AQS state key VIRGIN-ISLANDS
Virgin Islands · 2025 EPA AQS · 1 counties · med AQI 21 · 89.3% Good · St John→St John spread
- GOOD 21 Median AQI · Good
- SHARE 89.3% Good-day share
- COUNT 1 Counties monitored
- UNH 0 Unhealthy+ days
- PM25 100.0% Main pollutant share
Virgin Islands monitors 1 counties; St John and St John County bracket the in-state Good-day spread. Open St John County →
According to EPA AQS annual summaries on PlainAirData, Hawaii is #1 of 52 by day-weighted good-day share (93.8% of monitored days) at mean county median-AQI #4 (27.3) ≠ Alaska #1 lowest mean county median AQI (20.3) at good-day share #8 (84.4%).
Data updated August 2026
What changed, what drives it, and how thick is the sample
Three derived views WPR-style word count does not substitute for: release-over-release movement from county annual rows, the EPA main-pollutant day mix, and how many counties sit below the 100-day ranking floor.
Release change
89.3%
Good-day share in 2025, up 4.4 percentage points vs 2024. County-mean median AQI 21, 3.0 points higher (worse) than 2024.
Pollutant mix
PM2.5
Main driver on 100.0% of pollutant-assigned days.
- PM2.5 100.0%
Monitoring coverage
75
Average monitored days per county in the latest release. 1 of 1 counties sit below the 100-day floor used for cleanest/most-polluted claims.
Counties Monitored
1
Good Days %
89.3%
Avg Median AQI
21
Total Unhealthy Days
0
Best Air Quality
St John County
Worst Air Quality
St John County
Which counties in Virgin Islands have the cleanest and most polluted air?
| County | Good % | Median AQI | Max AQI | Unhealthy Days |
|---|---|---|---|---|
| St John | 89.3% | 21 | 75 | 0 |
Data Sources
Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by County dataset, 2020–2025. See our methodology for how AQI and median figures are computed.
Coverage: 1 counties in Virgin Islands with active monitoring stations. Unmonitored counties are not represented.
Source: U.S. EPA Air Quality System (AQS) Annual AQI by county summary files, aggregated to the state level · 2020–2025
Every figure on PlainAirData 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.
Informational only, not professional advice. Data from EPA AQS. See our disclaimer.