Worst air pollution Harrisburg, today and tomorrow
Today (16 July): Air quality in Harrisburg is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 9:00 AM (O3: 36.2/100).
Tomorrow (17 July 2026): Air quality in Harrisburg is fair. All pollutants stay as today. Pollution peaks around 9:00 AM (O3: 38.9/100). 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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Harrisburg's air quality reflects the Susquehanna River valley's position in the mid-Atlantic corridor, with vehicle emissions from I-83 and the Pennsylvania Turnpike combining with upwind industrial sources. The river valley provides natural ventilation, while summer ozone from the broader mid-Atlantic regional airshed and the Three Mile Island legacy corridor periodically elevate readings across the metropolitan area.
Today - 16 July | Pollution peaks at 09:00
AQI:
Fair
36.2/100
PM2.5 (fine particles):
Good
13.0/100
PM10 (coarse particles):
Good
10.6/100
NO2 (nitrogen dioxide):
Good
16.2/100
O3 (ozone):
Fair
36.2/100
SO2 (sulfur dioxide):
Good
2.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
7.2/100
PM1 (ultrafine particles):
Good
7.2/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 09:00
AQI:
Fair
38.9/100
PM2.5 (fine particles):
Good
11.3/100
PM10 (coarse particles):
Good
6.1/100
NO2 (nitrogen dioxide):
Good
17.7/100
O3 (ozone):
Fair
38.9/100
SO2 (sulfur dioxide):
Good
2.1/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
7.7/100
PM1 (ultrafine particles):
Good
6.6/100
Pollen forecast in Harrisburg
View pollen forecastAir quality forecasts for neighbourhoods and landmarks in Harrisburg
Frequently Asked Questions
Is air quality bad in Harrisburg right now?
On 16 July 2026, overall air quality in Harrisburg is fair. AQI is the main air quality indicator at 36.2/100. Pollution peaks around 9:00 AM (O3: 36.2/100).
Will air quality be worse tomorrow in Harrisburg?
On 17 July 2026, air quality conditions in Harrisburg will be similar to today, with AQI forecast at fair at 38.9/100. Pollution peaks around 9:00 AM (O3: 38.9/100).
When is air pollution at its worst in Harrisburg?
Like most US cities, Harrisburg sees air quality shift from season to season. In short, winter generally brings the cleanest air, once the summer ozone season has passed, whereas the hottest, most humid summer weeks bring the year's highest ozone readings. Dense urban traffic corridors add a persistent background level of pollution that varies less by season than ozone does.
Are air quality levels in Harrisburg 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.
Want to see air quality forecasts for other cities in United States?
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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