National City pollen forecast - today, tomorrow and the week ahead

Today (16 July) pollen in National City is low; grass and ragweed are low. Tomorrow (17 July 2026) levels are similar. Over the following five days grass and ragweed will increase. 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

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National City's San Diego Bay setting features coastal live oak, Canary Island palm, and acacia as the main tree pollen sources, with exposure varying between the limited greener residential areas and the more built-up commercial and industrial waterfront corridors along National City Boulevard. The San Diego Bay proximity creates strong marine temperature-modifying effects, while the bay waterfront setting means sea breezes create distinctly different pollen conditions between the bayside and inland areas throughout.

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):

    Low

    1/100

  • Oak (Quercus):

    None

    0/100

  • Willow (Salicaceae):

    None

    0/100

  • Mugwort (Artemisia):

    None

    0/100

  • Ragweed (Ambrosia):

    Low

    1/100

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 National City

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Frequently Asked Questions

Is pollen high in National City right now?

On 16 July 2026, overall pollen levels in National City are low. Ambrosia is the main contributor to airborne pollen, while grass remain at lower levels

Will pollen levels change in National City tomorrow?

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

Is pollen expected to decrease in National City this week?

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

Which pollen types are currently active in National City?

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

When is pollen season in National City?
National City's San Diego Bay setting produces a season opening in January with olive and coastal sage before grass from surrounding San Diego County land peaks through March and April. Mugwort extends exposure into September, while the very strong Pacific marine influence from the bay moderates temperatures year-round and onshore sea breezes can periodically suppress pollen dispersal across this bay waterfront city.
How often is the National City pollen forecast updated?

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

Does pollen in National City 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 National City 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 National City, 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 10:33 CEST (Data is updated four times daily.)

This page provides the latest public pollen forecast for National City.

For long term forecasts and maps, see the Airmine app

Download on the App Store Get it on Google Play

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