Valongo Pollen Forecast - Today, Tomorrow and the Week Ahead
Pollen Today
Today (10 October) pollen in Valongo is high; mugwort is high; mold (cladosporium) is moderate; mold (alternaria) is low.
Pollen Tomorrow
Tomorrow (11 October 2026) mold (alternaria) remains low, mold (cladosporium) remains moderate, mugwort declining.
7-Day Trend
Over the next week mold (alternaria) and mold (cladosporium) will increase; mugwort will decrease; cypress, grass, and willow will remain stable.
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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) | High | 61/100 |
| Mold (Alternaria) | Low | 24/100 |
| Mold (Cladosporium) | Moderate | 36/100 |
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) | None | 0/100 | |
| Willow (Salicaceae) | None | 0/100 | |
| Mugwort (Artemisia) | Moderate | 46/100 | |
| Mold (Alternaria) | Low | 16/100 | |
| Mold (Cladosporium) | Moderate | 34/100 |
Local Environmental Conditions
Most of the area around the center of Valongo is woodland, with a good deal of built-up land and some open grassland. Oak is the most prominent allergenic tree nearby, with alder also present. Beyond the trees, grasses matter a great deal, and plantain is the main weed source. In the built-up parts of the area, street trees, gardens and park lawns add to the local mix.
First to flower is alder, in late winter. Tree pollen peaks in mid-spring, when the weather warms to around 15°C and oak is in full flower. Grasses take over in late spring and keep pollen in the air into early fall. Plantain flowers through much of the warmer half of the year. Rain is heaviest in fall, often giving short breaks from high pollen levels.
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Frequently Asked Questions About Pollen in Porto
Is pollen high in Valongo right now?
On 10 October 2026, overall pollen levels in Valongo are high. Artemisia is the main contributor to airborne pollen
Will pollen levels change in Valongo tomorrow?
On 11 October 2026, pollen conditions in Valongo will be different from today, with artemisia continuing to decline
Is pollen expected to decrease in Valongo this week?
According to the five-day outlook, artemisia pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.
Which pollen types are currently active in Valongo?
On 10 October 2026, Artemisia is the dominant pollen source in Valongo. cypress, grass, and willow are not currently active.
When is pollen season in Valongo?
How often is the Valongo pollen forecast updated?
The Valongo pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Valongo 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 Valongo 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 Valongo, 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).
