Bellflower pollen forecast — St. John Bosco's Football Field neighborhood
Pollen Today
Today (20 September) pollen in St. John Bosco's Football Field, Bellflower is high; ragweed is high; grass is moderate; mugwort is low.
Pollen Tomorrow
Tomorrow (21 September 2026) ragweed remains high, grass declining, mugwort no longer expected.
7-Day Trend
Over the next week grass, mugwort, and ragweed will increase.
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Pollen Risk
Today - 20 September
| Pollen species | Level | Value |
|---|---|---|
| Alder (Alnus) | None | 0/100 |
| Birch (Betula) | None | 0/100 |
| Hazel (Corylus) | None | 0/100 |
| Cypress (Cupressaceae) | None | 0/100 |
| Grass (Poaceae) | Moderate | 38/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Low | 9/100 |
| Ragweed (Ambrosia) | High | 70/100 |
Tomorrow - 21 September
| Pollen species | Level | Value | 7-Day Trend |
|---|---|---|---|
| Alder (Alnus) | None | 0/100 | — |
| Birch (Betula) | None | 0/100 | — |
| Hazel (Corylus) | None | 0/100 | — |
| Cypress (Cupressaceae) | None | 0/100 | — |
| Grass (Poaceae) | Low | 25/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | None | 0/100 | |
| Ragweed (Ambrosia) | High | 61/100 |
Local Environmental Conditions
St. John Bosco's Football Field is set in the Bellflower suburban landscape of Los Angeles County, with introduced olive, eucalyptus, and palm as the main surrounding pollen sources. The Pacific Ocean coastal proximity means the marine layer can periodically suppress pollen dispersal, while the mild Southern California Mediterranean climate advances the season and mugwort extends exposure into September throughout this Los Angeles suburban school.
St. John Bosco's Football Field tracks Bellflower's broader pollen pattern, with olive and acacia appearing from January then eucalyptus follows, running through February. Grass pollen builds through March and April, and light weed pollen carries into September. Onshore Pacific breezes periodically clear the air, though inland valleys can still see elevated counts, which shapes conditions at St. John Bosco's Football Field much as it does elsewhere in Bellflower.
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Resource Hub
Sports venues in Bellflower 1 sports venue
Frequently Asked Questions About Pollen in California
Is pollen high in Bellflower right now?
On 20 September 2026, overall pollen levels in Bellflower are high. Ambrosia is the main contributor to airborne pollen, while grass and artemisia remain at lower levels
Will pollen levels change in Bellflower tomorrow?
On 21 September 2026, pollen conditions in Bellflower will be different from today, with ambrosia at high levels and grass continuing to decline
Is pollen expected to decrease in Bellflower 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 Bellflower?
On 20 September 2026, Ambrosia is the dominant pollen source in Bellflower. grass and artemisia are also present but at lower levels.
When is pollen season in Bellflower?
How often is the Bellflower pollen forecast updated?
The Bellflower pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Bellflower 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 Bellflower 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 Bellflower, 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.
Understanding the Scale
The 0–100 scores represent risk levels, not direct measurements of pollen or air pollutant concentrations. Higher scores indicate higher risk. Pollen and air quality use different thresholds.
Pollen
| None | 0 | No or negligible risk of exposure. Pollen/mold exposure is expected to be minimal. |
| Low | 0-25 | Low risk of exposure. Small amounts of pollen or mold spores may be present. |
| Moderate | 25-50 | Moderate risk of exposure. Pollen/mold exposure is expected to be noticeable. |
| High | 50-75 | High risk of exposure. Elevated pollen/mold exposure is expected. |
| Very High | 75-100 | Very high risk of exposure. Pollen/mold exposure is expected to be at or near its highest levels. |
Get More in the Airmine Pollen app
Get 15-day pollen forecasts with morning, afternoon and evening detail, plus 5-day air quality forecasts. Explore interactive pollen risk maps, estimated pollen season start, route profiles and a symptoms diary.
Features and forecast availability vary by region. Currently covering Europe, the contiguous US, southern Canada, South Africa, Australia, Indonesia (Java & Bali), Brazil, Paraguay, Uruguay and the Buenos Aires area.
Developed with support from the European Space Agency (ESA) Business Applications and Space Solutions (BASS).
