Upper Darby pollen forecast - today, tomorrow and the week ahead

On 16 July 2026, overall pollen levels in Upper Darby are moderate. Grass is the main contributor to airborne pollen, while ambrosia remain at lower levels

On 17 July 2026, pollen conditions in Upper Darby will be different from today, with grass continuing to decline

According to the five-day outlook, grass and ambrosia pollen levels will increase later in the week.

On 16 July 2026, Grass is the dominant pollen source in Upper Darby. ambrosia are also present but at lower levels. birch, cypress, oak, willow, alder, and artemisia are not currently active.

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.

The Upper Darby 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 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.