Custer pollen forecast - today, tomorrow and the week ahead

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

On 17 July 2026, pollen conditions in Custer will be different from today, with oak at low levels, ambrosia at low levels and grass increasing

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

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

In Custer, pollen season begins with elm and cottonwood starting in March then ash follows, running through April. Grass pollen builds through May and June, and a strong ragweed peak follows in late summer into September. Wide-open plains terrain lets pollen travel long distances on the prevailing wind throughout the year.

The Custer 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 Custer, 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.