Mammoth Lakes pollen forecast — Old Mammoth neighborhood
Pollen Today
Today (20 September) pollen in Old Mammoth, Mammoth Lakes is moderate; ragweed is moderate; mugwort is low.
Pollen Tomorrow
Tomorrow (21 September 2026) ragweed remains moderate, mugwort no longer expected.
7-Day Trend
Over the next week mugwort and ragweed will increase; grass will remain stable.
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Pollen Risk
Today - 20 September
| 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) | None | 0/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Low | 11/100 |
| Ragweed (Ambrosia) | Moderate | 43/100 |
Tomorrow - 21 September
| 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) | None | 0/100 | |
| Ragweed (Ambrosia) | Moderate | 27/100 |
Local Environmental Conditions
A stretch of alder and willow lines the water, feeding some of the season's mountain tree pollen, close by. Ponderosa pine and sugar pine dominating the treeline, both typical of Sierra Nevada montane forest; this sits close to this spot. Comparable land cover in surrounding areas tends to produce a similar pollen mix overall.
Average temperatures range from about -5°C in February to 18°C in July, and most of the 611 mm annual rainfall falls in the cooler months around February. Pollen activity typically picks up as temperatures climb out of the February low, from around March onward.
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Pollen forecast neighborhoods 43 neighborhoods
Frequently Asked Questions About Pollen in California
Is pollen high in Mammoth Lakes right now?
On 20 September 2026, overall pollen levels in Mammoth Lakes are moderate. Ambrosia is the main contributor to airborne pollen, while artemisia remain at lower levels
Will pollen levels change in Mammoth Lakes tomorrow?
On 21 September 2026, pollen conditions in Mammoth Lakes will be different from today, with ambrosia at moderate levels
Is pollen expected to decrease in Mammoth Lakes this week?
According to the five-day outlook, ambrosia and artemisia pollen levels will increase later in the week.
Which pollen types are currently active in Mammoth Lakes?
On 20 September 2026, Ambrosia is the dominant pollen source in Mammoth Lakes. artemisia are also present but at lower levels. grass are not currently active.
When is pollen season in Mammoth Lakes?
How often is the Mammoth Lakes pollen forecast updated?
The Mammoth Lakes pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Mammoth Lakes 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 Mammoth Lakes 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 Mammoth Lakes, 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 scores represent risk levels, not direct measurements of pollen or air pollutant concentrations. Higher scores indicate higher risk. Pollen and air quality use different thresholds.
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).
