Worst air pollution Winchester, today and tomorrow
Today (16 July): Air quality in Winchester is fair. AQI, NO2, and O3 are fair; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 1:00 PM (O3: 35.2/100).
Tomorrow (17 July 2026): Air quality in Winchester is fair. PM2.5 increases to fair; all other pollutants stay as today. Pollution peaks around 12:00 PM (O3: 39.5/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Winchester's air quality in Virginia benefits from the Shenandoah Valley's position between the Blue Ridge and Allegheny mountains, with vehicle emissions from I-81 the primary local source. The valley's topographic channelling provides ventilation corridors, while summer ozone from the naturally high biogenic Appalachian VOC emissions combining with vehicle NOₓ is the primary warm-season concern and the apple orchard agricultural heritage contributes seasonal organic aerosols.
Today - 16 July | Pollution peaks at 13:00
AQI:
Fair
35.2/100
PM2.5 (fine particles):
Good
16.4/100
PM10 (coarse particles):
Good
10.8/100
NO2 (nitrogen dioxide):
Fair
24.4/100
O3 (ozone):
Fair
35.2/100
SO2 (sulfur dioxide):
Good
3.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.5/100
PM1 (ultrafine particles):
Good
11.3/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 12:00
AQI:
Fair
39.5/100
PM2.5 (fine particles):
Fair
20.2/100
PM10 (coarse particles):
Good
12.8/100
NO2 (nitrogen dioxide):
Fair
23.7/100
O3 (ozone):
Fair
39.5/100
SO2 (sulfur dioxide):
Good
4.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.6/100
PM1 (ultrafine particles):
Good
13.0/100
Pollen forecast in Winchester
View pollen forecastFrequently Asked Questions
Is air quality bad in Winchester right now?
On 16 July 2026, overall air quality in Winchester is fair. AQI is the main air quality indicator at 35.2/100. Pollution peaks around 1:00 PM (O3: 35.2/100).
Will air quality be worse tomorrow in Winchester?
On 17 July 2026, air quality conditions in Winchester will be similar to today, with AQI forecast at fair at 39.5/100. Pollution peaks around 12:00 PM (O3: 39.5/100).
When is air pollution at its worst in Winchester?
Conditions in Winchester vary noticeably across the seasons: winter generally brings the cleanest air, once the summer ozone season has passed, but summer heat waves bring the highest ozone risk, compounded by pollution drifting in from the wider region. Dense urban traffic corridors add a persistent background level of pollution that varies less by season than ozone does.
Are air quality levels in Winchester based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
For long term forecasts and maps, see the Airmine app