Pollen Count & Forecast for London, City of London

London’s spring allergy season (March-May) is dominated by Birch and Plane pollen; Birch (Betula) prolific in Hyde Park and Regents Park; London Plane (Platanus x acerifolia) widespread across city streets and squares. Oak (Quercus) contributes significantly from larger London parks. Summer (May-July) sees high Grass (Poaceae) pollen levels, originating from extensive parklands like Richmond Park and along River Thames riverbanks.

Urban street canyons and dense architecture can trap pollen, leading to localised high concentrations. Autumn and winter see elevated Mould (Alternaria, Cladosporium) spore counts, primarily from decomposing leaf litter in parklands and damp city environments, concluding the annual allergy cycle.