Knollwood Golf Club - Old Course pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Knollwood Golf Club - Old Course is moderate; grass and ragweed are moderate; mugwort is low.
Pollen Tomorrow
Tomorrow (21 September 2026) grass declining, ragweed declining, mugwort no longer expected.
7-Day Trend
Over the next week grass, mugwort, and ragweed will increase.
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Pollen Risk
Today - 20 September
| 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 | 7/100 |
| Ragweed (Ambrosia) | Moderate | 41/100 |
Tomorrow - 21 September
| 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 | 9/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | None | 0/100 | |
| Ragweed (Ambrosia) | Low | 24/100 |
Local Environmental Conditions
Nearby, close to this spot, hazel and willow cluster near the water, an early and reliable source of allergenic pollen. Nearby, in the surrounding area, a mix of oak and birch trees, birch in particular a notorious spring allergen source. Local microclimate and soil conditions can push these figures slightly higher or lower.
Hazel and willow by the water are typically first out of the gate, starting well before the main spring rush, topping out around March. Oak and birch in the woodland come next, through the heart of spring, climbing steadily through spring to a peak in April or May. Grass pollen climbs toward a June peak, before ragweed becomes the more dominant allergen from mid-August into October.
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Frequently Asked Questions About Pollen in Ontario
Is pollen high in Knollwood Golf Club - Old Course right now?
On 20 September 2026, overall pollen levels in Knollwood Golf Club - Old Course are moderate. Grass is the main contributor to airborne pollen, while ambrosia and artemisia remain at lower levels
Will pollen levels change in Knollwood Golf Club - Old Course tomorrow?
On 21 September 2026, pollen conditions in Knollwood Golf Club - Old Course will be different from today, with grass, ambrosia continuing to decline
Is pollen expected to decrease in Knollwood Golf Club - Old Course 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 Knollwood Golf Club - Old Course?
On 20 September 2026, Grass is the dominant pollen source in Knollwood Golf Club - Old Course. ambrosia and artemisia are also present but at lower levels.
When is pollen season in Knollwood Golf Club - Old Course?
How often is the Knollwood Golf Club - Old Course pollen forecast updated?
The Knollwood Golf Club - Old Course pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Knollwood Golf Club - Old Course 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 Knollwood Golf Club - Old Course 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 Knollwood Golf Club - Old Course, 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 scores represent risk levels, not direct measurements of pollen or air pollutant concentrations. Higher scores indicate higher risk. Pollen and air quality use different thresholds.
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).
