Lower Merion pollen forecast - today, tomorrow and the week ahead

Today (9 August) pollen in Lower Merion is medium; ragweed is medium; grass and mugwort are low. Tomorrow (10 August 2026) levels are similar. Over the following five days 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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Lower Merion's Philadelphia suburban Pennsylvania Main Line setting features oak, tulip poplar, and maple as the main tree pollen sources, with exposure varying between the extensively wooded Wissahickon Valley and the more built-up commercial corridors along Montgomery Avenue and Lancaster Pike. The Wissahickon Creek corridor and the Mill Creek corridor are particularly significant local sources, creating distinct pollen gradients between the forested creek valleys and the more developed upland commercial areas.

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):

    Low

    2/100

  • Willow (Salicaceae):

    None

    0/100

  • Mugwort (Artemisia):

    Low

    4/100

  • Ragweed (Ambrosia):

    Medium

    32/100

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):

    Low

    5/100

  • Ragweed (Ambrosia):

    Medium

    34/100

Air quality in Lower Merion

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Frequently Asked Questions

Is pollen high in Lower Merion right now?

On 9 August 2026, overall pollen levels in Lower Merion are moderate. Ambrosia is the main contributor to airborne pollen, while artemisia and grass remain at lower levels

Will pollen levels change in Lower Merion tomorrow?

On 10 August 2026, pollen conditions in Lower Merion will be similar to today, with ambrosia at medium levels, artemisia at low levels, grass at low levels

Is pollen expected to decrease in Lower Merion 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 Lower Merion?

On 9 August 2026, Ambrosia is the dominant pollen source in Lower Merion. artemisia and grass are also present but at lower levels. cypress are not currently active.

When is pollen season in Lower Merion?
Lower Merion's Philadelphia suburban setting in Pennsylvania produces a season opening in late February with cedar and elm before oak peaks through April. Grass from surrounding Pennsylvania farmland peaks through May and June before mugwort and nettle extend exposure into September. The Schuylkill River valley channels airflows, while the moderate mid-Atlantic climate advances the season compared to more northern cities throughout.
How often is the Lower Merion pollen forecast updated?

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

Does pollen in Lower Merion 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 Lower Merion 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 Lower Merion, 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: 10 August 2026 at 02:34 CEST (Data is updated four times daily.)

This page provides the latest public pollen forecast for Lower Merion.

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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.