Philadelphia pollen forecast — Germantown neighborhood

On 22 August 2026, overall pollen levels in Philadelphia are high. Ambrosia is the main contributor to airborne pollen, while grass remain at lower levels

On 23 August 2026, pollen conditions in Philadelphia will be different from today, with ambrosia at high levels, artemisia at low levels and grass increasing

According to the five-day outlook, grass and artemisia pollen levels are expected to gradually decrease, while ambrosia pollen will increase, suggesting mixed conditions later in the week.

On 22 August 2026, Ambrosia is the dominant pollen source in Philadelphia. grass are also present but at lower levels. cypress and artemisia are not currently active.

Grass pollen becomes the dominant allergen through late spring, peaking in June, then gives way to ragweed, which drives the season's second major surge from mid-August into October. Exact peak dates shift by a few weeks year to year depending on temperature and rainfall. Daily pollen counts published for the wider region track this same seasonal rhythm closely.

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

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.

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.