Glendora pollen forecast - today, tomorrow and the week ahead
Today (9 August) pollen in Glendora is high; mugwort is high; ragweed is medium; cypress and grass are low. Tomorrow (10 August 2026) levels are similar - grass remains low, ragweed remains medium, mugwort declining. Over the following five days cypress, grass, mugwort, and ragweed will increase. 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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Glendora's San Gabriel Valley foothill California setting features walnut, coast live oak, and blue gum eucalyptus as the main tree pollen sources, with exposure varying between the San Gabriel Mountain foothills chaparral residential areas and the more built-up commercial corridors along Route 66. The San Gabriel River corridor provides locally significant green space, while the Southern California Black Walnut woodland on the hillsides contributes a distinctive native pollen source and the mountain backdrop creates downslope Santa Ana wind conditions.
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
9/100
-
Willow (Salicaceae):
None
0/100
-
Mugwort (Artemisia):
High
53/100
-
Ragweed (Ambrosia):
Medium
33/100
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
2/100
-
Willow (Salicaceae):
None
0/100
-
Mugwort (Artemisia):
Medium
44/100
-
Ragweed (Ambrosia):
Medium
26/100
Air quality in Glendora
View air qualityFrequently Asked Questions
Is pollen high in Glendora right now?
On 9 August 2026, overall pollen levels in Glendora are high. Artemisia is the main contributor to airborne pollen, while ambrosia, cypress, and grass remain at lower levels
Will pollen levels change in Glendora tomorrow?
On 10 August 2026, pollen conditions in Glendora will be different from today, with ambrosia at medium levels, grass at low levels and artemisia continuing to decline
Is pollen expected to decrease in Glendora this week?
According to the five-day outlook, ambrosia, artemisia, cypress, and grass pollen levels will increase later in the week.
Which pollen types are currently active in Glendora?
On 9 August 2026, Artemisia is the dominant pollen source in Glendora. ambrosia, cypress, and grass are also present but at lower levels.
When is pollen season in Glendora?
How often is the Glendora pollen forecast updated?
The Glendora pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Glendora 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 Glendora 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 Glendora, 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 Glendora.
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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.