Thornhill, Vaughan Pollen Forecast - Today, Tomorrow and the Week Ahead
Pollen Today
Today (10 October) pollen in Thornhill, Vaughan is low; ragweed, mold (alternaria), and mold (cladosporium) are low.
Pollen Tomorrow
Tomorrow (11 October 2026) mold (alternaria) remains low, mold (cladosporium) remains low, ragweed increasing, grass at low levels, mugwort at low levels.
7-Day Trend
Over the next week grass, mugwort, 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) | None | 0/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | None | 0/100 |
| Ragweed (Ambrosia) | Low | 5/100 |
| Mold (Alternaria) | Low | 8/100 |
| Mold (Cladosporium) | Low | 19/100 |
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) | Low | 18/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | Low | 15/100 | |
| Ragweed (Ambrosia) | Moderate | 27/100 | |
| Mold (Alternaria) | Low | 6/100 | |
| Mold (Cladosporium) | Low | 15/100 |
Local Environmental Conditions
Woodland and built-up land share the area around this part of Vaughan, plus some open grassland. Maple is the most prominent allergenic tree nearby, with poplar and oak also present. Grass pollen is plentiful, while ragweed and plantain lead among the weeds. In the built-up parts of the area, street trees, gardens and park lawns add to the local mix.
Maple, poplar and oak lead the season in mid-spring, as temperatures climb to around 5°C, and tree pollen reaches its peak. Grass pollen follows, peaking in early summer and easing off by early fall. The season closes with ragweed and plantain from late summer into mid-fall. By late fall, as temperatures fall to around 5°C, pollen levels are low again.
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Resource Hub
Pollen forecast neighborhoods 2 neighborhoods
Sports venues in Vaughan 3 sports venues
Frequently Asked Questions About Pollen in Ontario
Is pollen high in Vaughan right now?
On 10 October 2026, overall pollen levels in Vaughan are low. Ambrosia is the main contributor to airborne pollen
Will pollen levels change in Vaughan tomorrow?
On 11 October 2026, pollen conditions in Vaughan will be different from today, with artemisia at low levels, grass at low levels and ambrosia increasing
Is pollen expected to decrease in Vaughan this week?
According to the five-day outlook, ambrosia, artemisia, and grass pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.
Which pollen types are currently active in Vaughan?
On 10 October 2026, Ambrosia is the dominant pollen source in Vaughan. artemisia and grass are not currently active.
When is pollen season in Vaughan?
How often is the Vaughan pollen forecast updated?
The Vaughan pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Vaughan 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 Vaughan 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 Vaughan, 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).
