Vista Santa Rosa Pollen Forecast - Today, Tomorrow and the Week Ahead
Pollen Today
Today (6 October) pollen in Vista Santa Rosa is high; ragweed and mold (alternaria) are high; grass and mold (cladosporium) are moderate; mugwort is low.
Pollen Tomorrow
Tomorrow (7 October 2026) levels are similar to today.
7-Day Trend
Over the next week mold (cladosporium) will increase; grass, mugwort, ragweed, and mold (alternaria) 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) | Moderate | 30/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Low | 14/100 |
| Ragweed (Ambrosia) | High | 70/100 |
| Alternaria | High | 53/100 |
| Cladosporium | Moderate | 35/100 |
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) | Moderate | 32/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | Low | 17/100 | |
| Ragweed (Ambrosia) | High | 70/100 | |
| Alternaria | High | 57/100 | |
| Cladosporium | Moderate | 37/100 |
Local Environmental Conditions
The area around Vista Santa Rosa is a mix of farmland and woodland, plus some scrubland. Woodland on all sides makes trees an important local pollen source. Grasses are a major source, with ragweed and pigweed adding to the weed pollen load. Pasture and uncultivated field edges in the farmland provide room for grasses and weeds.
Flowering trees bring the first pollen of the year in early spring. Then come the grasses, strongest in mid-spring and fading by mid-fall. Later, ragweed and pigweed keep weed pollen in the air from late summer into mid-fall. In this dry climate, pollen can linger in the air for long spells without rain.
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Frequently Asked Questions About Pollen in California
Is pollen high in Vista Santa Rosa right now?
On 6 October 2026, overall pollen levels in Vista Santa Rosa are high. Ambrosia is the main contributor to airborne pollen, while grass and artemisia remain at lower levels
Will pollen levels change in Vista Santa Rosa tomorrow?
On 7 October 2026, pollen conditions in Vista Santa Rosa will be similar to today, with artemisia at low levels, grass at moderate levels, ambrosia at high levels
Is pollen expected to decrease in Vista Santa Rosa this week?
According to the five-day outlook, artemisia, grass, and ambrosia pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.
Which pollen types are currently active in Vista Santa Rosa?
On 6 October 2026, Ambrosia is the dominant pollen source in Vista Santa Rosa. grass and artemisia are also present but at lower levels.
When is pollen season in Vista Santa Rosa?
How often is the Vista Santa Rosa pollen forecast updated?
The Vista Santa Rosa pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Vista Santa Rosa 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 Vista Santa Rosa 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 Vista Santa Rosa, 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).
