U.S. Navy Mark VII #386, Tamalpais-Homestead Valley Pollen Forecast - Today, Tomorrow and the Week Ahead
Pollen Today
Today (6 October) pollen in U.S. Navy Mark VII #386, Tamalpais-Homestead Valley is low; grass, mugwort, ragweed, mold (alternaria), and mold (cladosporium) are low.
Pollen Tomorrow
Tomorrow (7 October 2026) grass remains low, ragweed remains low, mold (alternaria) remains low, mold (cladosporium) remains low, 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 - 6 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) | Low | 12/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Low | 2/100 |
| Ragweed (Ambrosia) | Low | 17/100 |
| Alternaria | Low | 14/100 |
| Cladosporium | Low | 25/100 |
Tomorrow - 7 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) | Low | 5/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | None | 0/100 | |
| Ragweed (Ambrosia) | Low | 11/100 | |
| Alternaria | Low | 11/100 | |
| Cladosporium | Low | 20/100 |
Local Environmental Conditions
This location in Tamalpais-Homestead Valley sits among a blend of woodland and open water, plus some open grassland. Hazel, oak and cypress are among the allergenic trees nearby. Grasses also feature strongly, alongside mugwort and plantain among the weeds. Compared with most places, mugwort is especially widespread here, which makes it one of the key local allergens.
The pollen year starts in late winter, when hazel and cypress flower. Tree pollen peaks in mid-spring, when the weather warms to around 10°C and oak is in full flower. Grasses take over in early summer and keep pollen in the air into early fall. Mugwort and plantain bring the strongest peak of the year through summer.
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Frequently Asked Questions About Pollen in California
Is pollen high in Tamalpais-Homestead Valley right now?
On 6 October 2026, overall pollen levels in Tamalpais-Homestead Valley are low. Ambrosia is the main contributor to airborne pollen, while artemisia and grass remain at lower levels
Will pollen levels change in Tamalpais-Homestead Valley tomorrow?
On 7 October 2026, pollen conditions in Tamalpais-Homestead Valley will be different from today, with ambrosia at low levels, grass at low levels
Is pollen expected to decrease in Tamalpais-Homestead Valley 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 Tamalpais-Homestead Valley?
On 6 October 2026, Ambrosia is the dominant pollen source in Tamalpais-Homestead Valley. artemisia and grass are also present but at lower levels.
When is pollen season in Tamalpais-Homestead Valley?
How often is the Tamalpais-Homestead Valley pollen forecast updated?
The Tamalpais-Homestead Valley pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Tamalpais-Homestead Valley 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 Tamalpais-Homestead Valley 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 Tamalpais-Homestead Valley, 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).
