Greenfield Park, Longueuil Pollen Forecast - Today, Tomorrow and the Week Ahead
Pollen Today
Today (11 October) pollen in Greenfield Park, Longueuil is low; mold (alternaria) and mold (cladosporium) are low.
Pollen Tomorrow
Tomorrow (12 October 2026) mold (alternaria) remains low, mold (cladosporium) remains low, mugwort at low levels, ragweed at moderate levels.
7-Day Trend
Over the next week mugwort, ragweed, mold (alternaria), and mold (cladosporium) will decrease; grass will remain stable.
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Pollen Risk
Today - 11 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) | None | 0/100 |
| Mold (Alternaria) | Low | 2/100 |
| Mold (Cladosporium) | Low | 7/100 |
Tomorrow - 12 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) | Low | 25/100 | |
| Ragweed (Ambrosia) | Moderate | 33/100 | |
| Mold (Alternaria) | Low | 7/100 | |
| Mold (Cladosporium) | Low | 17/100 |
Local Environmental Conditions
This site in Longueuil is surrounded mainly by built-up land, which covers around 74% of the nearby area, with some woodland. Lawns and planted trees in a nearby park add to local grass and tree pollen. Among allergenic trees nearby, maple leads, followed by oak and poplar. Grasses and weeds such as ragweed and pigweed round out the local mix.
Tree pollen peaks in mid-spring, when the weather warms to around 5°C and maple, oak and poplar are in full flower. Grass pollen follows, peaking in early summer and easing off by early fall. Ragweed and pigweed bring a final peak from late summer into mid-fall. By late fall, as temperatures fall to around freezing, pollen levels are low again.
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Frequently Asked Questions About Pollen in Quebec
Is pollen high in Longueuil right now?
Currently, there is no significant pollen in Longueuil.
Will pollen levels change in Longueuil tomorrow?
On 12 October 2026, pollen conditions in Longueuil will be different from today, with ambrosia at moderate levels, artemisia at low levels
Is pollen expected to decrease in Longueuil this week?
According to the five-day outlook, ambrosia and artemisia pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.
Which pollen types are currently active in Longueuil?
On 11 October 2026, there are no significant pollen types in Longueuil.
When is pollen season in Longueuil?
How often is the Longueuil pollen forecast updated?
The Longueuil pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Longueuil 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 Longueuil 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 Longueuil, 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).
