Pollen Count & Forecast for Croydon, Bromley

Croydon’s primary spring allergens are Birch (March-May) and Oak (April-June) pollen, sourced from abundant mature trees in Lloyd Park, Park Hill Park, and numerous urban street plantings. Summer brings ubiquitous Grass pollen (June-August), prevalent across open green spaces like Farthing Downs and along the River Wandle Trail’s banks.

The borough’s varied topography and urban heat island effect can concentrate pollen, intensifying exposure. Late-season Mould spores (September-November) proliferate from decaying organic matter in shaded, damp zones of local woodlands and leaf litter in residential areas, peaking post-rainfall.