East Los Angeles pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in East Los Angeles 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 | 41/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Low | 10/100 |
| 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 | 59/100 |
Local Environmental Conditions
East Los Angeles' urban setting features oak, eucalyptus, and introduced palm as the main tree pollen sources in parks and along streets, with exposure varying between these green areas and the densely built neighbourhoods. Surrounding Los Angeles County urban areas contribute additional tree and grass pollen, while onshore Pacific winds periodically disperse pollen across the coastal plain under prevailing westerly conditions.
East Los Angeles' pollen season opens with acacia and introduced olive from January in the mild Southern California climate. Oak and grass follow through March and April, with the season peaking earlier than most US cities. The densely built urban setting limits local vegetation, with exposure largely driven by pollen carried from surrounding parks and greener neighbourhoods under prevailing onshore Pacific winds.
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Pollen forecast neighborhoods 1 neighborhood
Frequently Asked Questions About Pollen in California
Is pollen high in East Los Angeles right now?
On 20 September 2026, overall pollen levels in East Los Angeles are high. Ambrosia is the main contributor to airborne pollen, while grass and artemisia remain at lower levels
Will pollen levels change in East Los Angeles tomorrow?
On 21 September 2026, pollen conditions in East Los Angeles will be different from today, with ambrosia at high levels and grass continuing to decline
Is pollen expected to decrease in East Los Angeles 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 East Los Angeles?
On 20 September 2026, Ambrosia is the dominant pollen source in East Los Angeles. grass and artemisia are also present but at lower levels.
When is pollen season in East Los Angeles?
How often is the East Los Angeles pollen forecast updated?
The East Los Angeles pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in East Los Angeles 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 East Los Angeles 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 East Los Angeles, 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).
