Bay Bridge, San Francisco Pollen Forecast - Today, Tomorrow and the Week Ahead
Pollen Today
Today (10 October) pollen in Bay Bridge, San Francisco is none.
Pollen Tomorrow
Tomorrow (11 October 2026) levels are similar to today.
7-Day Trend
Over the next week grass, mugwort, and ragweed will increase; mold (alternaria) and mold (cladosporium) will remain stable.
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Pollen Risk
Today - 10 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) | None | 0/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | None | 0/100 |
| Ragweed (Ambrosia) | None | 0/100 |
| Mold (Alternaria) | None | 0/100 |
| Mold (Cladosporium) | None | 0/100 |
Tomorrow - 11 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) | None | 0/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | None | 0/100 | |
| Ragweed (Ambrosia) | None | 0/100 | |
| Mold (Alternaria) | None | 0/100 | |
| Mold (Cladosporium) | None | 0/100 |
Local Environmental Conditions
This site in San Francisco is surrounded mainly by open water, which covers around 98% of the nearby area. Oak heads the list of allergenic trees in the wider area, ahead of cypress. Grasses, mugwort and plantain growing in the surroundings are the main non-tree sources of pollen. Local vegetation is sparse, so most pollen arrives on the wind from surrounding land.
First to flower is cypress, in late winter. Oak follows in mid-spring, as temperatures climb to around 10°C, and tree pollen reaches its peak. Grasses take over in early summer and keep pollen in the air into early fall. The season closes with mugwort and plantain through summer. Rain is heaviest in winter, often giving short breaks from high pollen levels.
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Pollen forecast neighborhoods 264 neighborhoods
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Frequently Asked Questions About Pollen in California
Is pollen high in San Francisco right now?
Currently, there is no significant pollen in San Francisco.
Will pollen levels change in San Francisco tomorrow?
On 11 October 2026, pollen conditions in San Francisco will be similar to today with no significant pollen expected.
Is pollen expected to decrease in San Francisco this week?
According to the five-day outlook, artemisia, grass, and ambrosia pollen levels will increase later in the week.
Which pollen types are currently active in San Francisco?
On 10 October 2026, there are no significant pollen types in San Francisco.
When is pollen season in San Francisco?
How often is the San Francisco pollen forecast updated?
The San Francisco pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in San Francisco 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 San Francisco 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 San Francisco, 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).
