London pollen forecast — Trafalger Square neighborhood

On 25 June 2026, overall pollen levels in London are low. Grass is the main contributor to airborne pollen

On 26 June 2026, pollen conditions in London will be different from today, with cypress at low levels and grass increasing

According to the five-day outlook, cypress and grass pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.

On 25 June 2026, Grass is the dominant pollen source in London. hazel, cypress, willow, alder, and birch are not currently active.

The Tower of London's pollen season opens in April with plane trees lining the Thames corridor as the main tree pollen source, followed by grass pollen from the inner ward peaking through June and July. The compact grounds mean local vegetation dominates exposure, with limited contribution from the wider city.

The London pollen forecast is updated four times daily. See the timestamp below for the most recent update.

Studies show that most pollen exposure (often 70–90%) comes from nearby sources, such as local trees and vegetation. A good pollen forecast therefore depends on accurately representing local vegetation. Pollen can travel long distances, but this usually matters only early in the season or during specific wind events.

Pollen data is often misunderstood. Most "pollen levels" are not real-time measurements, but forecasts.

Direct pollen measurements are typically delayed by 1-2 days because they require manual analysis. To show current conditions in London, modern forecasts combine recent measurements, weather data, and information about local vegetation.

This allows us to estimate pollen levels for today and the coming days, not just report the past.

Airmine’s atmospheric monitoring platform was developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team, using satellite and Earth observation technologies to improve emissions monitoring.