Harvard pollen forecast - today, tomorrow and the week ahead

On 30 August 2026, overall pollen levels in Harvard are high. Ambrosia is the main contributor to airborne pollen, while artemisia and grass remain at lower levels

On 31 August 2026, pollen conditions in Harvard will be different from today, with grass at moderate levels, ambrosia at high levels and artemisia continuing to decline

According to the five-day outlook, artemisia pollen levels are expected to gradually decrease, while grass and ambrosia pollen will increase, suggesting mixed conditions later in the week.

On 30 August 2026, Ambrosia is the dominant pollen source in Harvard. artemisia and grass are also present but at lower levels. cypress are not currently active.

Around Harvard, hazel and willow by the water are typically first out of the gate, peaking in late winter through March. Grass pollen rises through late spring toward a June high point, before ragweed takes over as the dominant allergen from mid-August through October. Local weather swings can shift these windows slightly, but the overall order tends to hold.

The Harvard 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 Harvard, 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.