Norwalk pollen forecast - today, tomorrow and the week ahead

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

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Norwalk's parks, including Cranbury Park and the Norwalk River corridor, feature oak, birch, and maple as the main tree pollen sources, with exposure varying between these green areas and the more built-up city centre. Surrounding Connecticut woodland and farmland contribute substantial tree and grass pollen, while the Long Island Sound coastline means onshore winds can periodically disperse urban pollen across the city.

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

    28/100

  • Oak (Quercus):

    Low

    10/100

  • Willow (Salicaceae):

    None

    0/100

  • Mugwort (Artemisia):

    None

    0/100

  • Ragweed (Ambrosia):

    Low

    10/100

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):

    Low

    4/100

  • Oak (Quercus):

    None

    0/100

  • Willow (Salicaceae):

    None

    0/100

  • Mugwort (Artemisia):

    None

    0/100

  • Ragweed (Ambrosia):

    None

    0/100

Air quality in Norwalk

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Frequently Asked Questions

Is pollen high in Norwalk right now?

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

Will pollen levels change in Norwalk tomorrow?

On 17 July 2026, pollen conditions in Norwalk will be different from today, with grass continuing to decline

Is pollen expected to decrease in Norwalk this week?

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

Which pollen types are currently active in Norwalk?

On 16 July 2026, Grass is the dominant pollen source in Norwalk. 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 Norwalk?
Norwalk's pollen season in California opens with acacia and introduced olive from January in the mild Southern California coastal climate. Oak and grass follow through March and April, with the season peaking earlier than most US cities. Onshore Pacific winds periodically disperse urban pollen, while the San Gabriel River corridor and surrounding Los Angeles County urban areas contribute additional tree and grass pollen across the coastal plain.
How often is the Norwalk pollen forecast updated?

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

Does pollen in Norwalk 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 Norwalk 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 Norwalk, 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:

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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 Norwalk.

For long term forecasts and maps, see the Airmine app

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