Pasadena pollen forecast - today, tomorrow and the week ahead

Today (25 June) pollen in Pasadena is none Tomorrow (26 June 2026) levels are similar - cypress at low levels, grass at low levels. Over the following five days cypress and grass 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

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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team

Pasadena's parks, including Central Park and the Arroyo Seco corridor, feature oak, sycamore, and introduced eucalyptus as the main tree pollen sources, with exposure varying between these green areas and the more built-up city centre. Surrounding San Gabriel Valley chaparral and the San Gabriel Mountain foothills contribute substantial grass and scrub pollen, while the valley setting concentrates pollen under offshore Santa Ana wind conditions.

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):

    Low

    6/100

  • Grass (Poaceae):

    Low

    3/100

  • Willow (Salicaceae):

    None

    0/100

Frequently Asked Questions

Is pollen high in Pasadena right now?

Currently, there is no significant pollen in Pasadena.

Will pollen levels change in Pasadena tomorrow?

On 26 June 2026, pollen conditions in Pasadena will be different from today, with cypress at low levels, grass at low levels

Is pollen expected to decrease in Pasadena this week?

According to the five-day outlook, cypress and grass pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.

Which pollen types are currently active in Pasadena?

On 25 June 2026, there are no significant pollen types in Pasadena.

When is pollen season in Pasadena?
Pasadena's pollen season in California opens with acacia and native oak from January in the mild San Gabriel Valley climate. Sycamore and grass follow through March and April, with the season peaking earlier than most US cities. The San Gabriel Mountain foothills channel airflows and concentrate pollen in the valley setting, while surrounding chaparral contributes substantial scrub pollen under offshore Santa Ana wind conditions.
How often is the Pasadena pollen forecast updated?

The Pasadena pollen forecast is updated four times daily. See the timestamp below for the most recent update.

Does pollen in Pasadena 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 Pasadena 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 Pasadena, 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?

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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 Pasadena.

For long term forecasts and maps, see the Airmine app

Download on the App Store Get it on Google Play

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.