Yosemite Mountain Sugar Pine Historical Railroad, Ahwahnee Pollen Forecast - Today, Tomorrow and the Week Ahead
Pollen Today
Today (7 October) pollen in Yosemite Mountain Sugar Pine Historical Railroad, Ahwahnee is moderate; mold (cladosporium) is moderate; grass, ragweed, and mold (alternaria) are low.
Pollen Tomorrow
Tomorrow (8 October 2026) grass remains low, ragweed remains low, mold (alternaria) remains low, mold (cladosporium) remains moderate, mugwort at low levels.
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 - 7 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 | 3/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | None | 0/100 |
| Ragweed (Ambrosia) | Low | 14/100 |
| Alternaria | Low | 18/100 |
| Cladosporium | Moderate | 27/100 |
Tomorrow - 8 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 | 8/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | Low | 3/100 | |
| Ragweed (Ambrosia) | Low | 19/100 | |
| Alternaria | Low | 18/100 | |
| Cladosporium | Moderate | 27/100 |
Local Environmental Conditions
This part of Ahwahnee is heavily wooded, with some open grassland. A watercourse nearby means riverside vegetation is part of the local pollen picture. The key allergenic tree nearby is oak. Grasses add a sizeable share of the local pollen. Roadside verges and patches of open ground provide further room for grasses and weeds.
Tree pollen peaks in mid-spring, when the weather warms to around 15°C and oak is in full flower. Grass pollen follows, peaking in late spring and easing off by early fall. A smaller weed peak follows from early summer into early fall. Rain is heaviest in winter, often giving short breaks from high pollen levels. By early winter, as temperatures fall to around 10°C, pollen levels are low again.
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Frequently Asked Questions About Pollen in California
Is pollen high in Ahwahnee right now?
On 7 October 2026, overall pollen levels in Ahwahnee are low. Grass is the main contributor to airborne pollen, while ambrosia remain at lower levels
Will pollen levels change in Ahwahnee tomorrow?
On 8 October 2026, pollen conditions in Ahwahnee will be different from today, with grass at low levels, ambrosia at low levels, artemisia at low levels
Is pollen expected to decrease in Ahwahnee this week?
According to the five-day outlook, grass and ambrosia 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 Ahwahnee?
On 7 October 2026, Grass is the dominant pollen source in Ahwahnee. ambrosia are also present but at lower levels. artemisia are not currently active.
When is pollen season in Ahwahnee?
How often is the Ahwahnee pollen forecast updated?
The Ahwahnee pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Ahwahnee 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 Ahwahnee 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 Ahwahnee, 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. |
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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).
