Arcadia pollen forecast - today, tomorrow and the week ahead
Today (9 August) pollen in Arcadia is medium; mugwort and ragweed are medium; cypress and grass are low. Tomorrow (10 August 2026) levels are similar - ragweed remains medium, mugwort declining. Over the following five days grass, mugwort, and ragweed will increase; cypress will remain stable. Forecasts are calculated by Airmine using satellites to map local vegetation and determine pollen season onset.
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Arcadia's San Gabriel Valley foothill setting features coast live oak, blue gum eucalyptus, and sycamore as the main tree pollen sources, with exposure varying between the wooded Santa Anita Canyon foothills residential areas and the more built-up commercial corridors along Huntington Drive. The Arcadia Arboretum and Botanic Garden contributes distinctive ornamental tree pollen diversity, while the San Gabriel Mountain backdrop creates downslope Santa Ana wind conditions that can concentrate pollen in the valley floor areas.
Today - 9 August
-
Alder (Alnus):
None
0/100
-
Birch (Betula):
None
0/100
-
Hazel (Corylus):
None
0/100
-
Cypress (Cupressaceae):
Low
3/100
-
Grass (Poaceae):
Low
5/100
-
Willow (Salicaceae):
None
0/100
-
Mugwort (Artemisia):
Medium
30/100
-
Ragweed (Ambrosia):
Medium
34/100
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):
None
0/100
-
Willow (Salicaceae):
None
0/100
-
Mugwort (Artemisia):
Low
23/100
-
Ragweed (Ambrosia):
Medium
28/100
Air quality in Arcadia
View air qualityFrequently Asked Questions
Is pollen high in Arcadia right now?
On 9 August 2026, overall pollen levels in Arcadia are moderate. Ambrosia is the main contributor to airborne pollen, while artemisia, cypress, and grass remain at lower levels
Will pollen levels change in Arcadia tomorrow?
On 10 August 2026, pollen conditions in Arcadia will be different from today, with ambrosia at medium levels and artemisia continuing to decline
Is pollen expected to decrease in Arcadia 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 Arcadia?
On 9 August 2026, Ambrosia is the dominant pollen source in Arcadia. artemisia, cypress, and grass are also present but at lower levels.
When is pollen season in Arcadia?
How often is the Arcadia pollen forecast updated?
The Arcadia pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Arcadia 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 Arcadia 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 Arcadia, 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: 10 August 2026 at 02:34 CEST (Data is updated four times daily.)
This page provides the latest public pollen forecast for Arcadia.
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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.