Worst air pollution Leominster, today and tomorrow

On 9 August 2026, overall air quality in Leominster is fair. PM1 is the main pollutant at 22.4/100. Pollution peaks around 4:00 PM (O3: 48.9/100).

On 10 August 2026, air quality conditions in Leominster will be similar to today, with AQI forecast at fair at 24.6/100. Pollution peaks around 6:00 PM (O3: 24.6/100).

Spring and autumn tend to be the calmer, more moderate stretches by comparison. Air quality in Leominster isn't the same all year round — it really shifts with the seasons. Winter tends to be worst, with wood burning, home heating, and still, cold air trapping traffic fumes from the A2 closer to ground level. Warmer months swap one problem for another — less smoke and heating pollution, but more ozone on the sunniest days.

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.

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.