Trois-Rivières pollen forecast — Cap-de-la-Madeleine (secteur) neighborhood
Pollen Today
Today (20 September) pollen in Cap-de-la-Madeleine (secteur), Trois-Rivières is high; ragweed is high; grass and mugwort are low.
Pollen Tomorrow
Tomorrow (21 September 2026) ragweed declining, grass no longer expected, 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) | Low | 17/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Low | 15/100 |
| Ragweed (Ambrosia) | High | 58/100 |
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) | None | 0/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | None | 0/100 | |
| Ragweed (Ambrosia) | Moderate | 33/100 |
Local Environmental Conditions
The Cap-de-la-Madeleine sector features maple, oak, and ash as the main pollen sources, with exposure varying between the St. Lawrence River shoreline greenery and the built-up pilgrimage-site district streets.
Sitting where the Saint-Maurice River meets the Saint Lawrence, Cap-de-la-Madeleine (secteur) experiences a river-plain pollen season, with floodplain forest and older residential streets driving a fairly strong spring bloom, while surrounding farmland sustains a steady grass and ragweed presence through late summer.
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Pollen forecast neighborhoods 3 neighborhoods
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Frequently Asked Questions About Pollen in Quebec
Is pollen high in Trois-Rivières right now?
On 20 September 2026, overall pollen levels in Trois-Rivières are high. Ambrosia is the main contributor to airborne pollen, while artemisia and grass remain at lower levels
Will pollen levels change in Trois-Rivières tomorrow?
On 21 September 2026, pollen conditions in Trois-Rivières will be different from today, with ambrosia continuing to decline
Is pollen expected to decrease in Trois-Rivières this week?
According to the five-day outlook, ambrosia, artemisia, and grass pollen levels will increase later in the week.
Which pollen types are currently active in Trois-Rivières?
On 20 September 2026, Ambrosia is the dominant pollen source in Trois-Rivières. artemisia and grass are also present but at lower levels.
When is pollen season in Trois-Rivières?
How often is the Trois-Rivières pollen forecast updated?
The Trois-Rivières pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Trois-Rivières 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 Trois-Rivières 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 Trois-Rivières, 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).
