Rennes pollen forecast — Centre historique neighborhood

On 9 August 2026, overall pollen levels in Rennes are high. Artemisia is the main contributor to airborne pollen, while grass remain at lower levels

On 10 August 2026, pollen conditions in Rennes will be different from today, with artemisia continuing to decline

According to the five-day outlook, artemisia and grass pollen levels will increase later in the week.

On 9 August 2026, Artemisia is the dominant pollen source in Rennes. grass are also present but at lower levels. hazel, cypress, and willow are not currently active.

In Centre historique, part of Rennes, the pollen season begins with hazel and alder from late January, with birch and oak rising to a peak by mid-spring, before grass from coastal pasture then carries the season into early summer, typical of this oceanic maritime part of France.

The Rennes 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 Rennes, 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.