Leominster pollen forecast — West Leominster neighborhood
Pollen Today
Today (20 September) pollen in West Leominster, Leominster is low; grass and ragweed are low.
Pollen Tomorrow
Tomorrow (21 September 2026) grass increasing, ragweed increasing, mugwort at low levels.
7-Day Trend
Over the next week grass, mugwort, and ragweed will decrease.
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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 | 6/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | None | 0/100 |
| Ragweed (Ambrosia) | Low | 22/100 |
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) | Moderate | 43/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | Low | 22/100 | |
| Ragweed (Ambrosia) | High | 59/100 |
Local Environmental Conditions
Here, not far from here, hazel and willow cluster near the water, an early and reliable source of allergenic pollen. Located within the neighborhood's edge, this area has woodland dominated by oak and birch, with birch a leading regional tree-pollen allergen. Actual counts still shift year to year with temperature, rainfall, and prevailing wind.
Hazel and willow near the water open the pollen calendar early, leading off the pollen calendar, with a peak generally falling in late winter. The nearby oak and birch stands take the lead as spring progresses, typically the year's sharpest tree-pollen spell, centered on April and May. As spring turns to summer, grass pollen rises toward its June high, and ragweed later takes the lead from mid-August through October.
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Pollen forecast neighborhoods 2 neighborhoods
Sports venues in Leominster 2 sports venues
Frequently Asked Questions About Pollen in Massachusetts
Is pollen high in Leominster right now?
On 20 September 2026, overall pollen levels in Leominster are low. Grass is the main contributor to airborne pollen, while ambrosia remain at lower levels
Will pollen levels change in Leominster tomorrow?
On 21 September 2026, pollen conditions in Leominster will be different from today, with artemisia at low levels and grass, ambrosia increasing
Is pollen expected to decrease in Leominster this week?
According to the five-day outlook, artemisia, grass, and ambrosia pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.
Which pollen types are currently active in Leominster?
On 20 September 2026, Grass is the dominant pollen source in Leominster. ambrosia are also present but at lower levels. artemisia are not currently active.
When is pollen season in Leominster?
How often is the Leominster pollen forecast updated?
The Leominster pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Leominster 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 Leominster 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 Leominster, 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).
