Oeiras pollen forecast - today, tomorrow and the week ahead
Today (9 August) pollen in Oeiras is low; grass and mugwort are low. Tomorrow (10 August 2026) levels are similar. Over the following five days mugwort will increase; grass will decrease. Forecasts are calculated by Airmine using satellites to map local vegetation and determine pollen season onset.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Oeiras' coastal parks and the Barcarena River corridor oak and eucalyptus provide most of the tree pollen, and grass from Lisboa farmland contributes through the spring weeks. The area's Atlantic exposure brings frequent rainfall interruptions.
Today - 9 August
-
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
15/100
High pollen levels may trigger sneezing, itchy eyes, and congestion. Airmine's neighbourhood estimates use satellites to map local vegetation and a statistical prediction model, updated four times daily.
Tomorrow - 10 August
-
Alder (Alnus):
None
0/100
-
Birch (Betula):
None
0/100
-
Hazel (Corylus):
None
0/100
-
Cypress (Cupressaceae):
None
0/100
-
Grass (Poaceae):
Low
6/100
-
Willow (Salicaceae):
None
0/100
-
Mugwort (Artemisia):
Low
20/100
Air quality in Oeiras
View air qualityFrequently Asked Questions
Is pollen high in Oeiras right now?
On 9 August 2026, overall pollen levels in Oeiras are low. Artemisia is the main contributor to airborne pollen, while grass remain at lower levels
Will pollen levels change in Oeiras tomorrow?
On 10 August 2026, pollen conditions in Oeiras will be similar to today, with artemisia at low levels, grass at low levels
Is pollen expected to decrease in Oeiras this week?
According to the five-day outlook, grass pollen levels are expected to gradually decrease, while artemisia pollen will increase, suggesting mixed conditions later in the week.
Which pollen types are currently active in Oeiras?
On 9 August 2026, Artemisia is the dominant pollen source in Oeiras. grass are also present but at lower levels. hazel, cypress, and willow are not currently active.
When is pollen season in Oeiras?
How often is the Oeiras pollen forecast updated?
The Oeiras pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Oeiras 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 Oeiras 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 Oeiras, 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.
Want to see pollen forecasts for other cities in Portugal?
Check pollen in other popular cities:
Data provided by Airmine — Last update: 10 August 2026 at 02:34 CEST (Data is updated four times daily.)
This page provides the latest public pollen forecast for Oeiras.
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Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.