Waterloo Pollen Forecast - Today, Tomorrow and the Week Ahead
Pollen Today
Today (10 October) pollen in Waterloo is moderate; mold (cladosporium) is moderate; grass, mugwort, ragweed, and mold (alternaria) are low.
Pollen Tomorrow
Tomorrow (11 October 2026) grass remains low, mugwort remains low, ragweed remains low, mold (alternaria) remains low, mold (cladosporium) declining.
7-Day Trend
Over the next week grass, mold (alternaria), and mold (cladosporium) will increase; mugwort and ragweed 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 | 4/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Low | 5/100 |
| Ragweed (Ambrosia) | Low | 16/100 |
| Mold (Alternaria) | Low | 16/100 |
| Mold (Cladosporium) | Moderate | 29/100 |
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 | 7/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | Low | 8/100 | |
| Ragweed (Ambrosia) | Low | 18/100 | |
| Mold (Alternaria) | Low | 5/100 | |
| Mold (Cladosporium) | Low | 14/100 |
Local Environmental Conditions
Almost 60% of the area near the center of Waterloo is built-up land, with a good deal of woodland. With the Grand River nearby, riverside trees such as willow, poplar and plane tree along its banks contribute to the local mix. Maple is the most prominent allergenic tree nearby, with oak also present. Grasses and weeds such as ragweed and plantain round out the local mix.
Tree pollen peaks in mid-spring, when the weather warms to around 5°C and maple and oak are in full flower. Then come the grasses, strongest in early summer and fading by late summer. Later, ragweed and plantain keep weed pollen in the air 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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Frequently Asked Questions About Pollen in Ontario
Is pollen high in Waterloo right now?
On 10 October 2026, overall pollen levels in Waterloo are low. Grass is the main contributor to airborne pollen, while ambrosia and artemisia remain at lower levels
Will pollen levels change in Waterloo tomorrow?
On 11 October 2026, pollen conditions in Waterloo will be similar to today, with grass at low levels, ambrosia at low levels, artemisia at low levels
Is pollen expected to decrease in Waterloo this week?
According to the five-day outlook, ambrosia and artemisia pollen levels are expected to gradually decrease, while grass pollen will increase, suggesting mixed conditions later in the week.
Which pollen types are currently active in Waterloo?
On 10 October 2026, Grass is the dominant pollen source in Waterloo. ambrosia and artemisia are also present but at lower levels.
When is pollen season in Waterloo?
How often is the Waterloo pollen forecast updated?
The Waterloo pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Waterloo 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 Waterloo 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 Waterloo, 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).
