Cambridge pollen forecast — Coolidge Hill neighborhood

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

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

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

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

The water-adjacent hazel and willow are early risers, leading off the pollen calendar, with a peak generally falling in late winter. Oak and birch in the woods pick up where the earlier species leave off, reaching its high point through April and into May. By late spring, grass pollen is climbing steadily toward a June high point, then gives way to ragweed, which drives the season's second major surge from mid-August into October.

The Cambridge 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 Cambridge, 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.