Worst air pollution Cemaes Bay, today and tomorrow

On 9 August 2026, overall air quality in Cemaes Bay is fair. AQI is the main air quality indicator at 33.9/100. Pollution peaks around 3:00 PM (O3: 33.9/100).

On 10 August 2026, air quality conditions in Cemaes Bay will be similar to today, with AQI forecast at fair at 21.4/100. Pollution peaks around 3:00 PM (O3: 21.4/100).

In Cemaes Bay, pollution levels don't stay flat — winter and summer look pretty different. The coldest months usually bring the worst readings, as heating and temperature inversions keep M4 emissions from dispersing normally. In summer, ozone can build up on sunny afternoons, though windier, warmer weather usually helps clear traffic-related pollution faster than in winter. For much of spring and autumn, things settle into a fairly unremarkable middle ground.

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.