Washington pollen forecast — Gonzaga College HS's Baseball Diamond neighborhood

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

On 17 July 2026, pollen conditions in Washington will be similar to today with no significant pollen expected.

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 Washington. ambrosia are also present but at lower levels. oak, willow, alder, artemisia, birch, and cypress are not currently active.

As a baseball venue within Washington, Gonzaga College HS's Baseball Diamond follows the same seasonal pollen curve, opening with cedar and elm from late February before oak peaks during April. Grass pollen rises through May and June, and mugwort and nettle extend exposure into September. The mild mid-Atlantic climate advances the season compared to more northern East Coast cities, which shapes conditions at Gonzaga College HS's Baseball Diamond much as it does elsewhere in Washington.

The Washington 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 Washington, 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.