Granite Bay Pollen Forecast - Today, Tomorrow and the Week Ahead
Pollen Today
Today (7 October) pollen in Granite Bay is moderate; grass, ragweed, and mold (cladosporium) are moderate; mugwort and mold (alternaria) are low.
Pollen Tomorrow
Tomorrow (8 October 2026) grass remains moderate, ragweed remains moderate, mold (alternaria) remains low, mold (cladosporium) remains moderate, mugwort no longer expected.
7-Day Trend
Over the next week mugwort will increase; grass, ragweed, mold (alternaria), and mold (cladosporium) will decrease.
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Pollen Risk
Today - 7 October
| 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 | 48/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Low | 4/100 |
| Ragweed (Ambrosia) | Moderate | 36/100 |
| Alternaria | Low | 23/100 |
| Cladosporium | Moderate | 31/100 |
Tomorrow - 8 October
| 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) | None | 0/100 | |
| Ragweed (Ambrosia) | Moderate | 31/100 | |
| Alternaria | Low | 24/100 | |
| Cladosporium | Moderate | 35/100 |
Local Environmental Conditions
Open water and open grassland share the area around Granite Bay, plus a good deal of woodland. Along running water nearby, trees such as poplar grow in the damper ground and add their own pollen. The key allergenic tree nearby is oak. Grasses also feature strongly, alongside plantain among the weeds.
Oak leads the season in mid-spring, as temperatures climb to around 15°C, and tree pollen reaches its peak. Grasses take over in late spring, with temperatures around 20°C, and their pollen lingers into early fall. Plantain flowers through much of the warmer half of the year. Winter is the wettest time of year, and heavy showers can bring short breaks in pollen.
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Frequently Asked Questions About Pollen in California
Is pollen high in Granite Bay right now?
On 7 October 2026, overall pollen levels in Granite Bay are moderate. Ambrosia is the main contributor to airborne pollen, while grass and artemisia remain at lower levels
Will pollen levels change in Granite Bay tomorrow?
On 8 October 2026, pollen conditions in Granite Bay will be different from today, with ambrosia at moderate levels, grass at moderate levels
Is pollen expected to decrease in Granite Bay this week?
According to the five-day outlook, ambrosia and grass pollen levels are expected to gradually decrease, while artemisia pollen will increase, suggesting mixed conditions later in the week.
Which pollen types are currently active in Granite Bay?
On 7 October 2026, Ambrosia is the dominant pollen source in Granite Bay. grass and artemisia are also present but at lower levels.
When is pollen season in Granite Bay?
How often is the Granite Bay pollen forecast updated?
The Granite Bay pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Granite Bay 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 Granite Bay 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 Granite Bay, 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 pollen scores represent risk levels, not direct pollen measurements. Higher scores indicate higher risk.
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).
