Current pollen levels for the UK’s larger cities. The UK pollen season runs from February to September: tree pollen first (hazel, alder, then birch and oak in spring), grass pollen from May to September — the main hay-fever trigger for most people — and weed pollen into early autumn.
About pollen monitoring
Copernicus CAMS — European pollen monitoring
Pollen concentrations come from the Copernicus Atmosphere Monitoring Service (CAMS) European model, which combines observations with atmospheric modelling. Values show grains per cubic metre of air, banded as Low, Moderate, High or Very high — the same bands used in UK pollen forecasts.