St. Louis pollen forecast — The Grove neighborhood

On 30 August 2026, overall pollen levels in St. Louis are high. Ambrosia is the main contributor to airborne pollen, while grass and artemisia remain at lower levels

On 31 August 2026, pollen conditions in St. Louis will be similar to today, with grass at moderate levels, ambrosia at high levels, artemisia at moderate levels

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

On 30 August 2026, Ambrosia is the dominant pollen source in St. Louis. grass and artemisia are also present but at lower levels. cypress are not currently active.

The Grove follows St. Louis's established pollen calendar, beginning with elm and cottonwood from March with ash following close behind through April. Grass follows, peaking through May and June, while a strong ragweed peak follows in late summer into September. Wide-open plains terrain lets pollen travel long distances on the prevailing wind, a defining feature of the local season.

The St. Louis 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 St. Louis, 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.