Mount Washington pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Mount Washington is low; grass and ragweed are low.
Pollen Tomorrow
Tomorrow (21 September 2026) grass remains low, ragweed increasing, mugwort at low levels.
7-Day Trend
Over the next week grass, mugwort, and ragweed will decrease.
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Features and forecast availability vary by region.
Pollen Risk
Today - 20 September
| Pollen species | Level | Value |
|---|---|---|
| Alder (Alnus) | None | 0/100 |
| Birch (Betula) | None | 0/100 |
| Hazel (Corylus) | None | 0/100 |
| Cypress (Cupressaceae) | None | 0/100 |
| Grass (Poaceae) | Low | 11/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | None | 0/100 |
| Ragweed (Ambrosia) | Low | 21/100 |
Tomorrow - 21 September
| Pollen species | Level | Value | 7-Day Trend |
|---|---|---|---|
| Alder (Alnus) | None | 0/100 | — |
| Birch (Betula) | None | 0/100 | — |
| Hazel (Corylus) | None | 0/100 | — |
| Cypress (Cupressaceae) | None | 0/100 | — |
| Grass (Poaceae) | Low | 19/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | Low | 5/100 | |
| Ragweed (Ambrosia) | Moderate | 30/100 |
Local Environmental Conditions
For Mount Washington, the riverbank shelters hazel and willow, two trees whose pollen travels readily on the breeze; this sits within the neighborhood. Here, just around the area, a mix of oak and birch trees, birch in particular a notorious spring allergen source. Ground-level conditions like local landscaping can nudge these figures slightly either way.
In Mount Washington, once hazel fades, oak and birch in the woods carry the season forward, reaching its high point through April and into May. Hazel and willow by the water are typically first out of the gate, starting well before the main spring rush, topping out around March. Late spring brings rising grass pollen that crests in June, with ragweed then rising to the fore from mid-August through October.
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Frequently Asked Questions About Pollen in Massachusetts
Is pollen high in Mount Washington right now?
On 20 September 2026, overall pollen levels in Mount Washington are low. Grass is the main contributor to airborne pollen, while ambrosia remain at lower levels
Will pollen levels change in Mount Washington tomorrow?
On 21 September 2026, pollen conditions in Mount Washington will be different from today, with grass at low levels, artemisia at low levels and ambrosia increasing
Is pollen expected to decrease in Mount Washington this week?
According to the five-day outlook, grass, ambrosia, and artemisia pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.
Which pollen types are currently active in Mount Washington?
On 20 September 2026, Grass is the dominant pollen source in Mount Washington. ambrosia are also present but at lower levels. artemisia are not currently active.
When is pollen season in Mount Washington?
How often is the Mount Washington pollen forecast updated?
The Mount Washington pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Mount Washington come from nearby or far away?
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.
Are pollen levels in Mount Washington based on measurements or forecasts?
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 Mount Washington, 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.
Understanding the Scale
The 0–100 scores represent risk levels, not direct measurements of pollen or air pollutant concentrations. Higher scores indicate higher risk. Pollen and air quality use different thresholds.
Pollen
| None | 0 | No or negligible risk of exposure. Pollen/mold exposure is expected to be minimal. |
| Low | 0-25 | Low risk of exposure. Small amounts of pollen or mold spores may be present. |
| Moderate | 25-50 | Moderate risk of exposure. Pollen/mold exposure is expected to be noticeable. |
| High | 50-75 | High risk of exposure. Elevated pollen/mold exposure is expected. |
| Very High | 75-100 | Very high risk of exposure. Pollen/mold exposure is expected to be at or near its highest levels. |
Get More in the Airmine Pollen app
Get 15-day pollen forecasts with morning, afternoon and evening detail, plus 5-day air quality forecasts. Explore interactive pollen risk maps, estimated pollen season start, route profiles and a symptoms diary.
Features and forecast availability vary by region. Currently covering Europe, the contiguous US, southern Canada, South Africa, Australia, Indonesia (Java & Bali), Brazil, Paraguay, Uruguay and the Buenos Aires area.
Developed with support from the European Space Agency (ESA) Business Applications and Space Solutions (BASS).
