Philadelphia pollen forecast — Winchester Park neighborhood
Pollen Today
Today (12 September) pollen in Winchester Park, Philadelphia is moderate; ragweed is moderate; grass is low.
Pollen Tomorrow
Tomorrow (13 September 2026) grass increasing, ragweed increasing, mugwort at low levels.
7-Day Trend
Over the next week grass, mugwort, and ragweed will decrease.
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Air Quality
Air Quality Forecast for Philadelphia AQI today AQI tomorrowPollen for Neighborhoods
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Pollen Risk
Today - 12 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) | Low | 24/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | None | 0/100 |
| Ragweed (Ambrosia) | Moderate | 43/100 |
Tomorrow - 13 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) | Moderate | 42/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | Low | 12/100 | |
| Ragweed (Ambrosia) | High | 59/100 |
Local Environmental Conditions
This area, a short distance from here, has moisture-loving hazel and willow dominate the bank, both quick to release pollen on the wind. Nearby, just around the area, forest where oak and birch make up much of the canopy, driving spring pollen counts. Located close to home here, this area has this park's mix of turf and landscaped trees contributes a modest grass and ragweed pollen load.
Near the bank, hazel and willow lead the seasonal calendar, leading off the pollen calendar, with a peak generally falling in late winter. Further into spring, the area's oak and birch stands drive the pollen count, peaking in the heart of spring, generally April into May. By late spring, grass pollen is climbing steadily toward a June high point, before ragweed becomes the more dominant allergen from mid-August into October.
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Frequently Asked Questions About Pollen in Pennsylvania
Is pollen high in Philadelphia right now?
On 12 September 2026, overall pollen levels in Philadelphia are moderate. Ambrosia is the main contributor to airborne pollen, while grass remain at lower levels
Will pollen levels change in Philadelphia tomorrow?
On 13 September 2026, pollen conditions in Philadelphia will be different from today, with artemisia at low levels and ambrosia, grass increasing
Is pollen expected to decrease in Philadelphia this week?
According to the five-day outlook, ambrosia, artemisia, and grass pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.
Which pollen types are currently active in Philadelphia?
On 12 September 2026, Ambrosia is the dominant pollen source in Philadelphia. grass are also present but at lower levels. artemisia are not currently active.
When is pollen season in Philadelphia?
How often is the Philadelphia pollen forecast updated?
The Philadelphia pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Philadelphia 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 Philadelphia 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 Philadelphia, 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 exposure is expected to be minimal. |
| Low | 0-25 | Low risk of exposure. Small amounts of pollen may be present. |
| Moderate | 25-50 | Moderate risk of exposure. Pollen exposure is expected to be noticeable. |
| High | 50-75 | High risk of exposure. Elevated pollen exposure is expected. |
| Very High | 75-100 | Very high risk of exposure. Pollen 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).
