Bristol, Illinois Pollen Forecast - Today, Tomorrow and the Week Ahead
Pollen Today
Today (10 October) pollen in Bristol, Illinois is moderate; mold (alternaria) and mold (cladosporium) are moderate; grass, mugwort, and ragweed are low.
Pollen Tomorrow
Tomorrow (11 October 2026) ragweed remains low, mold (alternaria) remains moderate, mold (cladosporium) remains moderate, grass no longer expected, mugwort no longer expected.
7-Day Trend
Over the next week grass and mugwort will increase; ragweed, mold (alternaria), and mold (cladosporium) will decrease.
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Pollen Risk
Today - 10 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 | 6/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Low | 7/100 |
| Ragweed (Ambrosia) | Low | 10/100 |
| Mold (Alternaria) | Moderate | 37/100 |
| Mold (Cladosporium) | Moderate | 40/100 |
Tomorrow - 11 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) | None | 0/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | None | 0/100 | |
| Ragweed (Ambrosia) | Low | 9/100 | |
| Mold (Alternaria) | Moderate | 33/100 | |
| Mold (Cladosporium) | Moderate | 30/100 |
Local Environmental Conditions
The area around the center of Bristol is a mix of open grassland and farmland, plus a good deal of woodland. Close to the Fox River, riverside vegetation adds to local tree pollen. Oak and maple are among the allergenic trees nearby. Grasses and weeds such as ragweed round out the local mix.
Tree pollen peaks in late spring, when the weather warms to around 15°C and oak and maple are in full flower. Then come the grasses, strongest in early summer and fading by early fall. Ragweed brings a final peak from late summer into mid-fall. Rain is heaviest in summer, often giving short breaks from high pollen levels.
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Frequently Asked Questions About Pollen in Illinois
Is pollen high in Bristol, Illinois right now?
On 10 October 2026, overall pollen levels in Bristol, Illinois are low. Ambrosia is the main contributor to airborne pollen, while artemisia and grass remain at lower levels
Will pollen levels change in Bristol, Illinois tomorrow?
On 11 October 2026, pollen conditions in Bristol, Illinois will be different from today, with ambrosia at low levels
Is pollen expected to decrease in Bristol, Illinois this week?
According to the five-day outlook, ambrosia pollen levels are expected to gradually decrease, while artemisia and grass pollen will increase, suggesting mixed conditions later in the week.
Which pollen types are currently active in Bristol, Illinois?
On 10 October 2026, Ambrosia is the dominant pollen source in Bristol, Illinois. artemisia and grass are also present but at lower levels.
When is pollen season in Bristol, Illinois?
How often is the Bristol, Illinois pollen forecast updated?
The Bristol, Illinois pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Bristol, Illinois 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 Bristol, Illinois 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 Bristol, Illinois, 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).
