Upper Darby pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Upper Darby is high; ragweed is high; grass is moderate; mugwort is low.
Pollen Tomorrow
Tomorrow (21 September 2026) grass declining, ragweed 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 | 42/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Low | 8/100 |
| Ragweed (Ambrosia) | High | 55/100 |
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 | 15/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | None | 0/100 | |
| Ragweed (Ambrosia) | Moderate | 26/100 |
Local Environmental Conditions
Upper Darby's parks and the Darby Creek corridor feature oak, maple, and ash as the main tree pollen sources, with exposure varying between these green areas and the more built-up areas. Surrounding Delaware County woodland and farmland contribute substantial tree and grass pollen, while the flat coastal plain landscape allows pollen to disperse readily across the greater Philadelphia metropolitan area.
Upper Darby's pollen season opens with maple and elm from late February, followed by oak and ash through April and May. Grass pollen peaks through June and July, with ragweed extending the season into September. As part of the greater Philadelphia metropolitan area, the season is well-defined and intense, while surrounding Delaware County woodland and farmland contribute substantial tree and grass pollen under prevailing westerly winds.
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Pollen forecast neighborhoods 1 neighborhood
Frequently Asked Questions About Pollen in Pennsylvania
Is pollen high in Upper Darby right now?
On 20 September 2026, overall pollen levels in Upper Darby are high. Ambrosia is the main contributor to airborne pollen, while grass and artemisia remain at lower levels
Will pollen levels change in Upper Darby tomorrow?
On 21 September 2026, pollen conditions in Upper Darby will be different from today, with grass, ambrosia continuing to decline
Is pollen expected to decrease in Upper Darby this week?
According to the five-day outlook, artemisia, grass, and ambrosia pollen levels will increase later in the week.
Which pollen types are currently active in Upper Darby?
On 20 September 2026, Ambrosia is the dominant pollen source in Upper Darby. grass and artemisia are also present but at lower levels.
When is pollen season in Upper Darby?
How often is the Upper Darby pollen forecast updated?
The Upper Darby pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Upper Darby 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 Upper Darby 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 Upper Darby, 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).
