Worst air pollution Harpers Ferry National Historical Park - Harpers Ferry, today and tomorrow
Today (9 August): Air quality in Harpers Ferry National Historical Park 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 Harpers Ferry National Historical Park 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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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Harpers Ferry National Historical Park's air quality benefits from the dramatic Shenandoah-Potomac rivers confluence position, with the river valley channelling of Atlantic westerlies through the Blue Ridge gap providing reliable ventilation. Vehicle traffic on the surrounding approach roads contributes modest local sources, while the rivers' confluence ventilation corridor and the surrounding Appalachian wilderness generally maintain Harpers Ferry among the region's more pleasantly ventilated historic sites throughout most of the year.
Today - 9 August | Pollution peaks at 12:00
AQI:
Fair
35.2/100
PM2.5 (fine particles):
Good
8.6/100
PM10 (coarse particles):
Good
3.3/100
NO2 (nitrogen dioxide):
Good
0.6/100
O3 (ozone):
Fair
35.2/100
SO2 (sulfur dioxide):
Good
0.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.7/100
PM1 (ultrafine particles):
Good
5.9/100
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
8.0/100
PM10 (coarse particles):
Good
3.2/100
NO2 (nitrogen dioxide):
Good
0.5/100
O3 (ozone):
Fair
35.7/100
SO2 (sulfur dioxide):
Good
0.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.0/100
PM1 (ultrafine particles):
Good
5.6/100
Other Landmarks in Harpers Ferry
Frequently Asked Questions
Is air quality bad in Harpers Ferry National Historical Park right now?
On 9 August 2026, overall air quality in Harpers Ferry National Historical Park 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 Harpers Ferry National Historical Park?
On 10 August 2026, air quality conditions in Harpers Ferry National Historical Park 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 Harpers Ferry National Historical Park?
Air quality at Harpers Ferry National Historical Park shifts across the year, as mild winter weather usually brings the year's cleanest air; by contrast, summer heat, humidity, and emissions from surrounding forests combine to drive ozone levels up. Occasional agricultural or prescribed-burning smoke can add short-lived particulate spikes outside the main summer ozone season.
Are air quality levels in Harpers Ferry National Historical Park 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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