Pollen Count & Forecast for Harrow

Harrow’s allergy profile sees dominant spring Birch and Oak pollen (March-May), sourced from extensive woodlands at Bentley Priory Nature Reserve and Harrow Weald Common; followed by peak summer Grass pollen (June-August) from local playing fields and River Pinn’s marginal meadows.

Topography, including Harrow Hill’s elevation and sheltered suburban parks, can localise and intensify pollen concentrations; late-season mould spores (Sept-Nov) elevate from damp leaf decomposition in parklands and shaded urban areas.