Brentwood pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Brentwood is moderate; mugwort is moderate.
Pollen Tomorrow
Tomorrow (21 September 2026) levels are similar to today.
7-Day Trend
Over the next week mugwort will increase; cypress, grass, and willow will remain stable.
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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) | None | 0/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Moderate | 37/100 |
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) | None | 0/100 | |
| Willow (Salicaceae) | None | 0/100 | |
| Mugwort (Artemisia) | Moderate | 49/100 |
Local Environmental Conditions
Brentwood sees oak and beech as the leading tree pollen contributors, with levels differing noticeably between well-vegetated suburbs and the denser core. Surrounding Essex farmland contributes substantial grass and tree pollen, moving into town when winds blow from the south-west. The relatively open, low-lying landscape lets pollen disperse readily across the area through the season.
Pollen season in Brentwood really gets going with oak, followed not long after by beech. Oak gets going around April and tapers off by May, before beech takes over, usually April to May. Grass season overlaps a lot of this too, running May through September and peaking mid-summer. Useful to know if you tend to feel it every spring.
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Frequently Asked Questions About Pollen in Essex
Is pollen high in Brentwood right now?
On 20 September 2026, overall pollen levels in Brentwood are moderate. Artemisia is the main contributor to airborne pollen
Will pollen levels change in Brentwood tomorrow?
On 21 September 2026, pollen conditions in Brentwood will be similar to today, with artemisia at moderate levels
Is pollen expected to decrease in Brentwood this week?
According to the five-day outlook, artemisia pollen levels will increase later in the week.
Which pollen types are currently active in Brentwood?
On 20 September 2026, Artemisia is the dominant pollen source in Brentwood. cypress, grass, and willow are not currently active.
When is pollen season in Brentwood?
How often is the Brentwood pollen forecast updated?
The Brentwood pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Brentwood 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 Brentwood 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 Brentwood, 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).
