Tucson Pollen Forecast - Today, Tomorrow and the Week Ahead
Pollen Today
Today (11 October) pollen in Tucson is moderate; grass, ragweed, and mold (cladosporium) are moderate; mugwort and mold (alternaria) are low.
Pollen Tomorrow
Tomorrow (12 October 2026) ragweed remains moderate, mold (alternaria) remains low, mold (cladosporium) remains moderate, grass declining, mugwort 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 - 11 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 | 34/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Low | 9/100 |
| Ragweed (Ambrosia) | Moderate | 50/100 |
| Mold (Alternaria) | Low | 22/100 |
| Mold (Cladosporium) | Moderate | 31/100 |
Tomorrow - 12 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 | 18/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | None | 0/100 | |
| Ragweed (Ambrosia) | Moderate | 35/100 | |
| Mold (Alternaria) | Low | 18/100 | |
| Mold (Cladosporium) | Moderate | 28/100 |
Local Environmental Conditions
Tucson's pollen comes from a mix of desert plants and city landscaping. Mesquite is the main native tree allergen, while olive and fruitless mulberry trees, planted widely in the past, are so allergenic that Pima County has restricted new plantings. Bermuda grass on lawns, parks and golf courses is possibly the worst grass offender, and Johnson grass grows along washes and roadsides. Ragweed, desert broom and tumbleweed thrive on vacant lots and disturbed desert ground around the city, especially after the summer monsoon rains.
Tucson has two main pollen seasons. Spring begins early, as mild winters averaging around 12°C in January let juniper, cottonwood and mulberry flower from February. Mesquite and olive follow from March to May, when tree pollen is usually at its highest. Bermuda grass pollen lasts from spring well into fall. After the July and August monsoon storms, ragweed, desert broom and tumbleweed bring a second peak from August to October, before cooler weather in Tucson from December brings the quietest months.
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Pollen forecast neighborhoods 13 neighborhoods
Sports venues in Tucson 1 sports venue
Frequently Asked Questions About Pollen in Arizona
Is pollen high in Tucson right now?
On 11 October 2026, overall pollen levels in Tucson are moderate. Ambrosia is the main contributor to airborne pollen, while grass and artemisia remain at lower levels
Will pollen levels change in Tucson tomorrow?
On 12 October 2026, pollen conditions in Tucson will be different from today, with ambrosia at moderate levels and grass continuing to decline
Is pollen expected to decrease in Tucson 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 Tucson?
On 11 October 2026, Ambrosia is the dominant pollen source in Tucson. grass and artemisia are also present but at lower levels.
When is pollen season in Tucson?
How often is the Tucson pollen forecast updated?
The Tucson pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Tucson 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 Tucson 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 Tucson, 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).
