Portland pollen forecast — Oregon Museum of Science and Industry neighborhood

Today (9 August) pollen in Oregon Museum of Science and Industry, Portland is none Tomorrow (10 August 2026) levels are similar - mugwort at low levels, ragweed at low levels. Over the following five days 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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Oregon Museum of Science and Industry is a pacific Northwest city with Douglas fir, bigleaf maple, and hazels. Hazel and alder bloom in February — one of the earliest spring pollen triggers in the US. Tree season runs through May; grass follows through July.

Today - 9 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):

    None

    0/100

  • Ragweed (Ambrosia):

    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 - 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

    3/100

  • Ragweed (Ambrosia):

    Low

    15/100

Other Landmarks in Portland

Alberta Arts District Division Street Forest Park Hawthorne District International Rose Test Garden Ladd's Addition Lan Su Chinese Garden Mississippi Avenue Mount Tabor Park Multnomah Falls Oregon Museum of Science and Industry Overlook Park Pearl District Portland Art Museum Powell Butte Nature Park Sellwood Slabtown St. Johns Willamette Waterfront Woodstock

Frequently Asked Questions

Is pollen high in Portland right now?

Currently, there is no significant pollen in Portland.

Will pollen levels change in Portland tomorrow?

On 10 August 2026, pollen conditions in Portland will be different from today, with ambrosia at low levels, artemisia at low levels

Is pollen expected to decrease in Portland 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 Portland?

On 9 August 2026, there are no significant pollen types in Portland.

When is pollen season in Portland?
Like the rest of Portland, Oregon Museum of Science and Industry experiences a season that opens with alder and birch from February before maple takes over and peaks through March and April. Grass pollen builds through May and June, and mugwort and nettle extend exposure into September. The mild, wet Pacific Northwest climate and frequent spring rain periodically wash pollen from the air, consistent with the wider Portland area.
How often is the Portland pollen forecast updated?

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

Does pollen in Portland 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 Portland 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 Portland, 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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Check pollen in other popular cities:

Melton Rio de Janeiro Copenhagen Athens Denpasar Rome Cape Town Barcelona London Los Angeles New York

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 Oregon Museum of Science and Industry, Portland.

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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.