Holliston pollen forecast - today, tomorrow and the week ahead

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

On 31 August 2026, pollen conditions in Holliston will be similar to today, with grass at moderate levels, ambrosia at high levels, artemisia at low levels

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 Holliston. grass and artemisia are also present but at lower levels. cypress are not currently active.

In Holliston, oak and birch in the nearby woodland follow in mid-to-late spring, reaching its high point through April and into May. Hazel and willow along the water get the season underway before other species, building through the tail end of winter into March. Grass pollen builds through late spring and peaks in June, handing off to ragweed, which peaks from mid-August through October.

The Holliston 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 Holliston, 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.