Byron, California Pollen Forecast - Today, Tomorrow and the Week Ahead
Pollen Today
Today (6 October) pollen in Byron, California is high; ragweed is high; grass, mold (alternaria), and mold (cladosporium) are moderate; mugwort is low.
Pollen Tomorrow
Tomorrow (7 October 2026) mugwort remains low, ragweed remains high, mold (alternaria) remains moderate, mold (cladosporium) remains moderate, grass declining.
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) | Moderate | 29/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Low | 5/100 |
| Ragweed (Ambrosia) | High | 56/100 |
| Alternaria | Moderate | 48/100 |
| Cladosporium | Moderate | 34/100 |
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 | 23/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | Low | 1/100 | |
| Ragweed (Ambrosia) | High | 51/100 | |
| Alternaria | Moderate | 47/100 | |
| Cladosporium | Moderate | 35/100 |
Local Environmental Conditions
Almost 55% of the area near this site in Byron, California, is farmland, with some open grassland and built-up land. Grass pollen is plentiful, while pigweed leads among the weeds. Pasture and uncultivated field edges in the farmland provide room for grasses and weeds. Pollen also travels on the wind, so vegetation in the wider surroundings adds to local levels as well.
Grass pollen follows, peaking in late spring and easing off by early fall. The season closes with pigweed from early summer into early fall. Winter is the wettest time of year, and heavy showers can bring short breaks in pollen. Weather shapes each of these periods: dry, windy spells drive levels up, and showers wash pollen out of the air.
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Frequently Asked Questions About Pollen in California
Is pollen high in Byron, California right now?
On 6 October 2026, overall pollen levels in Byron, California are high. Ambrosia is the main contributor to airborne pollen, while grass and artemisia remain at lower levels
Will pollen levels change in Byron, California tomorrow?
On 7 October 2026, pollen conditions in Byron, California will be different from today, with ambrosia at high levels, artemisia at low levels and grass continuing to decline
Is pollen expected to decrease in Byron, California this week?
According to the five-day outlook, ambrosia and grass 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 Byron, California?
On 6 October 2026, Ambrosia is the dominant pollen source in Byron, California. grass and artemisia are also present but at lower levels.
When is pollen season in Byron, California?
How often is the Byron, California pollen forecast updated?
The Byron, California pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Byron, California 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 Byron, California 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 Byron, California, 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).
