San Joaquin Hills Pollen Forecast - Today, Tomorrow and the Week Ahead
Pollen Today
Today (6 October) pollen in San Joaquin Hills is moderate; ragweed is moderate; grass, mold (alternaria), and mold (cladosporium) are low.
Pollen Tomorrow
Tomorrow (7 October 2026) levels are similar to today.
7-Day Trend
Over the next week mugwort and mold (cladosporium) will increase; grass, 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) | Low | 18/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | None | 0/100 |
| Ragweed (Ambrosia) | Moderate | 31/100 |
| Alternaria | Low | 17/100 |
| Cladosporium | Low | 20/100 |
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) | Low | 19/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | None | 0/100 | |
| Ragweed (Ambrosia) | Moderate | 32/100 | |
| Alternaria | Low | 17/100 | |
| Cladosporium | Low | 19/100 |
Local Environmental Conditions
The area around this site in San Joaquin Hills is a mix of scrubland and woodland. The leading allergenic tree nearby is oak, with plane tree and willow close behind. Grasses are a major source, with pigweed and mugwort adding to the weed pollen load. Locally, scrubland contributes pollen from shrubs, grasses and herbs.
Tree pollen peaks in late spring, when the weather warms to around 15°C and oak, plane tree and willow are in full flower. Grass pollen follows, peaking in early summer and easing off by mid-fall. Pigweed and mugwort bring a final peak from early summer into early fall. Rain is heaviest in winter, often giving short breaks from high pollen levels.
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Frequently Asked Questions About Pollen in California
Is pollen high in San Joaquin Hills right now?
On 6 October 2026, overall pollen levels in San Joaquin Hills are moderate. Ambrosia is the main contributor to airborne pollen, while grass remain at lower levels
Will pollen levels change in San Joaquin Hills tomorrow?
On 7 October 2026, pollen conditions in San Joaquin Hills will be similar to today, with grass at low levels, ambrosia at moderate levels
Is pollen expected to decrease in San Joaquin Hills 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 San Joaquin Hills?
On 6 October 2026, Ambrosia is the dominant pollen source in San Joaquin Hills. grass are also present but at lower levels. artemisia are not currently active.
When is pollen season in San Joaquin Hills?
How often is the San Joaquin Hills pollen forecast updated?
The San Joaquin Hills pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in San Joaquin Hills 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 Joaquin Hills 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 Joaquin Hills, 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).
