San Tan Valley Pollen Forecast - Today, Tomorrow and the Week Ahead
Pollen Today
Today (10 October) pollen in San Tan Valley is high; ragweed and mold (alternaria) are high; mold (cladosporium) is moderate; grass and mugwort are low.
Pollen Tomorrow
Tomorrow (11 October 2026) mugwort remains low, mold (cladosporium) remains moderate, ragweed declining, mold (alternaria) declining, grass no longer expected.
7-Day Trend
Over the next week grass, mugwort, ragweed, mold (alternaria), and mold (cladosporium) will increase.
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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) | Low | 10/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Low | 21/100 |
| Ragweed (Ambrosia) | High | 51/100 |
| Mold (Alternaria) | High | 55/100 |
| Mold (Cladosporium) | Moderate | 40/100 |
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) | Low | 11/100 | |
| Ragweed (Ambrosia) | Moderate | 42/100 | |
| Mold (Alternaria) | Moderate | 43/100 | |
| Mold (Cladosporium) | Moderate | 39/100 |
Local Environmental Conditions
The center of San Tan Valley is surrounded mainly by farmland, which covers around 77% of the nearby area. Around here, farmland adds grass and weed pollen. Pasture and uncultivated field edges in the farmland provide room for grasses and weeds. Wind carries pollen over long distances, so the wider landscape also shapes what arrives here.
Grasses take over in mid-spring, with temperatures around 20°C, and their pollen lingers into mid-fall. A smaller weed peak follows from early summer into early fall. In this dry climate, pollen can linger in the air for long spells without rain. Day to day, sunshine and wind lift the counts, while a spell of rain can bring them down sharply.
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Frequently Asked Questions About Pollen in Arizona
Is pollen high in San Tan Valley right now?
On 10 October 2026, overall pollen levels in San Tan Valley are high. Ambrosia is the main contributor to airborne pollen, while artemisia and grass remain at lower levels
Will pollen levels change in San Tan Valley tomorrow?
On 11 October 2026, pollen conditions in San Tan Valley will be different from today, with artemisia at low levels and ambrosia continuing to decline
Is pollen expected to decrease in San Tan Valley 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 San Tan Valley?
On 10 October 2026, Ambrosia is the dominant pollen source in San Tan Valley. artemisia and grass are also present but at lower levels.
When is pollen season in San Tan Valley?
How often is the San Tan Valley pollen forecast updated?
The San Tan Valley pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in San Tan 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 San Tan 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 San Tan 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).
