Worst air pollution Winchester, today and tomorrow
Today (9 August): Air quality in Winchester is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 12:00 PM (O3: 35.2/100).
Tomorrow (10 August 2026): Air quality in Winchester is fair. All pollutants stay as today. Pollution peaks around 8:00 AM (O3: 35.7/100). Airmine updates local air quality forecasts four times daily.
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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 - 9 August | Pollution peaks at 12:00
AQI:
Fair
35.2/100
PM2.5 (fine particles):
Good
12.6/100
PM10 (coarse particles):
Good
4.8/100
NO2 (nitrogen dioxide):
Good
11.2/100
O3 (ozone):
Fair
35.2/100
SO2 (sulfur dioxide):
Good
3.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.7/100
PM1 (ultrafine particles):
Good
8.7/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 08:00
AQI:
Fair
35.7/100
PM2.5 (fine particles):
Good
11.7/100
PM10 (coarse particles):
Good
4.8/100
NO2 (nitrogen dioxide):
Good
8.5/100
O3 (ozone):
Fair
35.7/100
SO2 (sulfur dioxide):
Good
3.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.0/100
PM1 (ultrafine particles):
Good
8.2/100
Pollen forecast in Winchester
View pollen forecastAir quality forecasts for neighbourhoods and landmarks in Winchester
Frequently Asked Questions
Is air quality bad in Winchester right now?
On 9 August 2026, overall air quality in Winchester is fair. AQI is the main air quality indicator at 35.2/100. Pollution peaks around 12:00 PM (O3: 35.2/100).
Will air quality be worse tomorrow in Winchester?
On 10 August 2026, air quality conditions in Winchester will be similar to today, with AQI forecast at fair at 35.7/100. Pollution peaks around 8:00 AM (O3: 35.7/100).
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.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
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Data provided by Airmine — Last update: 9 August 2026 at 20:27 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.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.
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