Woodland Hills pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Woodland Hills is high; ragweed is high; grass is moderate; mugwort is low.
Pollen Tomorrow
Tomorrow (21 September 2026) ragweed remains high, grass declining, mugwort no longer expected.
7-Day Trend
Over the next week grass, mugwort, and ragweed will increase.
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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) | Moderate | 39/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Low | 11/100 |
| Ragweed (Ambrosia) | High | 70/100 |
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 | 24/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | None | 0/100 | |
| Ragweed (Ambrosia) | High | 58/100 |
Local Environmental Conditions
El Camino Real HS's Baseball Diamond sits in the Woodland Hills suburban landscape of the western San Fernando Valley, with introduced olive, oak, and California sycamore as the main surrounding pollen sources. The Santa Monica Mountains to the south contribute native chaparral vegetation pollen, while the warm valley climate advances the season and the valley setting can concentrate pollen under calm conditions throughout this western San Fernando Valley school.
Pollen season at El Camino Real HS's Baseball Diamond follows Woodland Hills's regional pattern, opening with olive and acacia from January with eucalyptus joining in and continuing through February. Peak grass pollen arrives in March and April, and light weed pollen carries into September. Mild year-round temperatures push the pollen calendar earlier than in most of the country, consistent with the wider Woodland Hills area.
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Frequently Asked Questions About Pollen in California
Is pollen high in Woodland Hills right now?
On 20 September 2026, overall pollen levels in Woodland Hills are high. Ambrosia is the main contributor to airborne pollen, while grass and artemisia remain at lower levels
Will pollen levels change in Woodland Hills tomorrow?
On 21 September 2026, pollen conditions in Woodland Hills will be different from today, with ambrosia at high levels and grass continuing to decline
Is pollen expected to decrease in Woodland Hills this week?
According to the five-day outlook, ambrosia, artemisia, and grass pollen levels will increase later in the week.
Which pollen types are currently active in Woodland Hills?
On 20 September 2026, Ambrosia is the dominant pollen source in Woodland Hills. grass and artemisia are also present but at lower levels.
When is pollen season in Woodland Hills?
How often is the Woodland Hills pollen forecast updated?
The Woodland Hills pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Woodland Hills 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 Woodland Hills 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 Woodland Hills, 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).
