Chelmsford pollen forecast — West Chelmsford neighborhood
Pollen Today
Today (20 September) pollen in West Chelmsford, Chelmsford 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 | 16/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | None | 0/100 |
| Ragweed (Ambrosia) | Low | 12/100 |
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) | High | 52/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | Low | 19/100 | |
| Ragweed (Ambrosia) | Moderate | 48/100 |
Local Environmental Conditions
Nearby, a short distance from here, the waterside growth here is largely hazel and willow, both efficient wind-pollen dispersers. This area, close to home here, has green space with maintained lawn and planted trees, both contributing to grass and ragweed counts. Local wind exposure and land use can shift the exact mix slightly from block to block.
The water-adjacent hazel and willow are early risers, usually peaking sometime between late winter and the end of March. Through late spring, grass pollen climbs steadily toward its June peak, then gives way to ragweed, which drives the season's second major surge from mid-August into October. Exact peak dates shift by a few weeks year to year depending on temperature and rainfall.
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Resource Hub
Pollen forecast neighborhoods 3 neighborhoods
Sports venues in Chelmsford 1 sports venue
Frequently Asked Questions About Pollen in Massachusetts
Is pollen high in Chelmsford right now?
On 20 September 2026, overall pollen levels in Chelmsford are low. Ambrosia is the main contributor to airborne pollen, while grass remain at lower levels
Will pollen levels change in Chelmsford tomorrow?
On 21 September 2026, pollen conditions in Chelmsford will be different from today, with artemisia at low levels and ambrosia, grass increasing
Is pollen expected to decrease in Chelmsford this week?
According to the five-day outlook, ambrosia, artemisia, and grass pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.
Which pollen types are currently active in Chelmsford?
On 20 September 2026, Ambrosia is the dominant pollen source in Chelmsford. grass are also present but at lower levels. artemisia are not currently active.
When is pollen season in Chelmsford?
How often is the Chelmsford pollen forecast updated?
The Chelmsford pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Chelmsford 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 Chelmsford 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 Chelmsford, 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).
