Belfast pollen forecast - today, tomorrow and the week ahead
Today (18 July) pollen in Belfast is low; grass and ragweed are low. Tomorrow (19 July 2026) levels are similar - ragweed remains low, grass increasing. Over the following five days grass and ragweed will decrease. Forecasts are calculated by Airmine using satellites to map local vegetation and determine pollen season onset.
For long term forecasts and maps, see the Airmine app
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
Use our Strava plugin to check your own exposure.
Belfast sits on a harbor town on Penobscot Bay, where the dominant vegetation is a mix of red spruce and balsam fir, paper birch, and coastal shrubland, shaping the local pollen profile across the seasons. Wind patterns across the area help determine how far pollen travels from these source plants. The mix of native and introduced species here is fairly typical for this part of the country.
Today - 18 July
-
Alder (Alnus):
None
0/100
-
Birch (Betula):
None
0/100
-
Hazel (Corylus):
None
0/100
-
Cypress (Cupressaceae):
None
0/100
-
Grass (Poaceae):
Low
21/100
-
Oak (Quercus):
None
0/100
-
Willow (Salicaceae):
None
0/100
-
Mugwort (Artemisia):
None
0/100
-
Ragweed (Ambrosia):
Low
6/100
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 - 19 July
-
Alder (Alnus):
None
0/100
-
Birch (Betula):
None
0/100
-
Hazel (Corylus):
None
0/100
-
Cypress (Cupressaceae):
None
0/100
-
Grass (Poaceae):
Medium
32/100
-
Oak (Quercus):
None
0/100
-
Willow (Salicaceae):
None
0/100
-
Mugwort (Artemisia):
None
0/100
-
Ragweed (Ambrosia):
Low
20/100
Air quality in Belfast
View air qualityFrequently Asked Questions
Is pollen high in Belfast right now?
On 18 July 2026, overall pollen levels in Belfast are low. Ambrosia is the main contributor to airborne pollen, while grass remain at lower levels
Will pollen levels change in Belfast tomorrow?
On 19 July 2026, pollen conditions in Belfast will be different from today, with ambrosia at low levels and grass increasing
Is pollen expected to decrease in Belfast this week?
According to the five-day outlook, ambrosia and grass pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.
Which pollen types are currently active in Belfast?
On 18 July 2026, Ambrosia is the dominant pollen source in Belfast. grass are also present but at lower levels. artemisia, birch, cypress, oak, willow, and alder are not currently active.
When is pollen season in Belfast?
How often is the Belfast pollen forecast updated?
The Belfast pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Belfast 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 Belfast 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 Belfast, 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 United States?
Check pollen in other popular cities:
Data provided by Airmine — Last update: 18 July 2026 at 15:48 CEST (Data is updated four times daily.)
This page provides the latest public pollen forecast for Belfast.
For long term forecasts and maps, see the Airmine app
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.