Diamond Bar pollen forecast - today, tomorrow and the week ahead
Today (25 June) pollen in Diamond Bar is none Tomorrow (26 June 2026) levels are similar. 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
Diamond Bar's eastern Los Angeles County Pomona Valley foothill setting features walnut, oak, and toyon as the main tree pollen sources, with the Southern California Black Walnut woodlands being a particularly distinctive and locally significant native pollen source. Exposure varies between the walnut woodland-covered hillsides and the more built-up commercial corridors along Diamond Bar Boulevard, while the Puente Hills topography creates downslope wind conditions that concentrate pollen in valley floor areas.
Today - 25 June
-
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
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 - 26 June
-
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
Frequently Asked Questions
Is pollen high in Diamond Bar right now?
Currently, there is no significant pollen in Diamond Bar.
Will pollen levels change in Diamond Bar tomorrow?
On 26 June 2026, pollen conditions in Diamond Bar will be similar to today with no significant pollen expected.
Is pollen expected to decrease in Diamond Bar this week?
According to the five-day outlook, cypress and grass pollen levels will increase later in the week.
Which pollen types are currently active in Diamond Bar?
On 25 June 2026, there are no significant pollen types in Diamond Bar.
When is pollen season in Diamond Bar?
How often is the Diamond Bar pollen forecast updated?
The Diamond Bar pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Diamond Bar 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 Diamond Bar 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 Diamond Bar, 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: 25 Jun 2026, 09:01 CET (Data is updated four times daily.)
This page provides the latest public pollen forecast for Diamond Bar.
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
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.