LaSalle Pollen Forecast - Today, Tomorrow and the Week Ahead
Pollen Today
Today (10 October) pollen in LaSalle is moderate; grass, ragweed, mold (alternaria), and mold (cladosporium) are moderate; mugwort is low.
Pollen Tomorrow
Tomorrow (11 October 2026) mold (alternaria) declining, mold (cladosporium) declining, grass no longer expected, mugwort no longer expected, ragweed no longer expected.
7-Day Trend
Over the next week grass, mugwort, ragweed, mold (alternaria), and mold (cladosporium) will increase.
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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) | Moderate | 26/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Low | 23/100 |
| Ragweed (Ambrosia) | Moderate | 31/100 |
| Mold (Alternaria) | Moderate | 41/100 |
| Mold (Cladosporium) | Moderate | 47/100 |
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) | None | 0/100 | |
| Mold (Alternaria) | Low | 14/100 | |
| Mold (Cladosporium) | Low | 21/100 |
Local Environmental Conditions
The heart of LaSalle is surrounded mainly by farmland, with a good deal of woodland and some open grassland. Close to the Detroit River, riverside trees such as willow, poplar and plane tree add to local tree pollen. Oak heads the list of allergenic trees nearby, ahead of hazel. Grasses and weeds such as ragweed round out the local mix.
First to flower is hazel, in early spring. Oak follows in late spring, as temperatures climb to around 15°C, and tree pollen reaches its peak. Grasses take over in early summer, with temperatures around 20°C, and their pollen lingers into early fall. Later, ragweed keeps weed pollen in the air from late summer into mid-fall. By late fall, pollen levels are low again.
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Frequently Asked Questions About Pollen in Ontario
Is pollen high in LaSalle right now?
On 10 October 2026, overall pollen levels in LaSalle are moderate. Grass is the main contributor to airborne pollen, while ambrosia and artemisia remain at lower levels
Will pollen levels change in LaSalle tomorrow?
On 11 October 2026, pollen conditions in LaSalle will be similar to today with no significant pollen expected.
Is pollen expected to decrease in LaSalle this week?
According to the five-day outlook, artemisia, grass, and ambrosia pollen levels will increase later in the week.
Which pollen types are currently active in LaSalle?
On 10 October 2026, Grass is the dominant pollen source in LaSalle. ambrosia and artemisia are also present but at lower levels.
When is pollen season in LaSalle?
How often is the LaSalle pollen forecast updated?
The LaSalle pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in LaSalle 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 LaSalle 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 LaSalle, 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).
