Pollen Count & Forecast for Bolton, Blackburn with Darwen

Bolton’s spring allergy profile, March-May, is dominated by early-flowering Birch and Alder from Queens Park and residential street trees; followed by Oak and Sycamore pollen, particularly from Leverhulme Park and Rivington Pike woodlands, extending into June. Peak summer sees widespread Grass pollen (June-July) originating from Moses Gate Country Park meadows and surrounding agricultural lands.

The urban valley topography, often humid, can trap and concentrate pollen locally. Late autumn brings heightened mould spore exposure (September-November) from damp leaf litter decomposition in parks and shaded residential areas, exacerbated by Bolton’s high rainfall.