Worst air pollution Harleston, today and tomorrow
Today (9 August): Air quality in Harleston is fair. NO2 is fair; AQI and O3 are medium; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 7:00 PM (O3: 44.0/100).
Tomorrow (10 August 2026): Air quality in Harleston is fair. AQI worsens to fair; NO2 decreases to good; O3 increases to fair; all other pollutants stay as today. Pollution peaks around 12:00 AM (O3: 22.6/100). 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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Harleston's position in Norfolk means air quality is mostly determined by local road traffic and the compact scale of the centre. Inland breezes from the surrounding countryside generally provide reasonable ventilation, keeping levels close to typical UK urban averages for a town this size. Traffic on the A55 is the most significant local emissions source, especially at peak times.
Today - 9 August | Pollution peaks at 19:00
AQI:
Medium
44.0/100
PM2.5 (fine particles):
Good
9.8/100
PM10 (coarse particles):
Good
3.4/100
NO2 (nitrogen dioxide):
Fair
29.1/100
O3 (ozone):
Medium
44.0/100
SO2 (sulfur dioxide):
Good
4.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.7/100
PM1 (ultrafine particles):
Good
10.6/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 00:00
AQI:
Fair
22.6/100
PM2.5 (fine particles):
Good
5.2/100
PM10 (coarse particles):
Good
2.0/100
NO2 (nitrogen dioxide):
Good
9.8/100
O3 (ozone):
Fair
22.6/100
SO2 (sulfur dioxide):
Good
2.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.4/100
PM1 (ultrafine particles):
Good
4.7/100
Pollen forecast in Harleston
View pollen forecastFrequently Asked Questions
Is air quality bad in Harleston right now?
On 9 August 2026, overall air quality in Harleston is fair. NO2 is the main pollutant at 29.1/100. Pollution peaks around 7:00 PM (O3: 44.0/100).
Will air quality be worse tomorrow in Harleston?
On 10 August 2026, air quality conditions in Harleston will be similar to today, with AQI forecast at fair at 22.6/100. Pollution peaks around 12:00 AM (O3: 22.6/100).
When is air pollution at its worst in Harleston?
For much of spring and autumn, things settle into a fairly unremarkable middle ground. Ask a local in Harleston and they'll tell you air quality changes noticeably from season to season. Once the heating goes on and the air turns still, pollution from the A55 and nearby chimneys tends to build up rather than clear. Summer sunshine can drive up ozone locally, though overall air generally moves and clears more freely than in winter.
Are air quality levels in Harleston 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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