Salem pollen forecast - today, tomorrow and the week ahead

Today (16 July) pollen in Salem is medium; grass is medium; oak and ragweed are low. Tomorrow (17 July 2026) levels are similar. Over the following five days grass, oak, and ragweed will increase. Forecasts are calculated by Airmine using satellites to map local vegetation and determine pollen season onset.

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Salem's parks, including Bush's Pasture Park and the Willamette River corridor, feature alder, oak, and Douglas fir as the main tree pollen sources, with exposure varying between these green areas and the more built-up city centre. Surrounding Willamette Valley farmland and woodland contribute substantial tree and grass pollen, while the valley setting channels airflows and concentrates pollen across the city under prevailing northerly winds.

Today - 16 July

  • Alder (Alnus):

    None

    0/100

  • Birch (Betula):

    None

    0/100

  • Hazel (Corylus):

    None

    0/100

  • Cypress (Cupressaceae):

    None

    0/100

  • Grass (Poaceae):

    Medium

    33/100

  • Oak (Quercus):

    Low

    13/100

  • Willow (Salicaceae):

    None

    0/100

  • Mugwort (Artemisia):

    None

    0/100

  • Ragweed (Ambrosia):

    Low

    16/100

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 - 17 July

  • 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

  • Oak (Quercus):

    None

    0/100

  • Willow (Salicaceae):

    None

    0/100

  • Mugwort (Artemisia):

    None

    0/100

  • Ragweed (Ambrosia):

    None

    0/100

Air quality in Salem

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Frequently Asked Questions

Is pollen high in Salem right now?

On 16 July 2026, overall pollen levels in Salem are moderate. Grass is the main contributor to airborne pollen, while oak and ambrosia remain at lower levels

Will pollen levels change in Salem tomorrow?

On 17 July 2026, pollen conditions in Salem will be similar to today with no significant pollen expected.

Is pollen expected to decrease in Salem this week?

According to the five-day outlook, grass, oak, and ambrosia pollen levels will increase later in the week.

Which pollen types are currently active in Salem?

On 16 July 2026, Grass is the dominant pollen source in Salem. oak and ambrosia are also present but at lower levels. willow, alder, artemisia, birch, and cypress are not currently active.

When is pollen season in Salem?
Salem's pollen season opens with alder from January, followed by birch and oak through March and April. Grass pollen peaks strongly through June and July in the Willamette Valley, one of the highest grass pollen areas in the US. The valley setting channels prevailing northerly winds and can concentrate pollen under calm conditions, while frequent Pacific rainfall provides regular interruptions throughout the season.
How often is the Salem pollen forecast updated?

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

Does pollen in Salem 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 Salem 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 Salem, 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: 16 July 2026 at 05:36 CEST (Data is updated four times daily.)

This page provides the latest public pollen forecast for Salem.

For long term forecasts and maps, see the Airmine app

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