Louisville pollen forecast — St. Xavier HS's Baseball Diamond neighborhood
Pollen Today
Today (20 September) pollen in St. Xavier HS's Baseball Diamond, Louisville is high; ragweed is high; grass is moderate; mugwort is low.
Pollen Tomorrow
Tomorrow (21 September 2026) grass declining, ragweed declining, mugwort no longer expected.
7-Day Trend
Over the next week grass, mugwort, and ragweed will increase.
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Pollen Risk
Today - 20 September
| Pollen species | Level | Value |
|---|---|---|
| Alder (Alnus) | None | 0/100 |
| Birch (Betula) | None | 0/100 |
| Hazel (Corylus) | None | 0/100 |
| Cypress (Cupressaceae) | None | 0/100 |
| Grass (Poaceae) | Moderate | 43/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Low | 11/100 |
| Ragweed (Ambrosia) | High | 60/100 |
Tomorrow - 21 September
| Pollen species | Level | Value | 7-Day Trend |
|---|---|---|---|
| Alder (Alnus) | None | 0/100 | — |
| Birch (Betula) | None | 0/100 | — |
| Hazel (Corylus) | None | 0/100 | — |
| Cypress (Cupressaceae) | None | 0/100 | — |
| Grass (Poaceae) | Low | 13/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | None | 0/100 | |
| Ragweed (Ambrosia) | Moderate | 30/100 |
Local Environmental Conditions
St. Xavier HS's Baseball Diamond is set in the Louisville suburban landscape of Jefferson County, Kentucky, with oak, maple, and ash as the main surrounding tree pollen sources. Surrounding Kentucky woodland and farmland contribute substantial tree and grass pollen, while the Ohio River valley setting channels airflows and mugwort extends exposure into September throughout this Louisville suburban Catholic school setting.
Louisville's regional pollen pattern holds at St. Xavier HS's Baseball Diamond, with cedar and elm first appearing in February before oak peaks during March and April. Grass pollen rises through April and May, and ragweed extends the weed season into September. Mild winters across the Southeast push the pollen calendar earlier than in most of the country, consistent with the wider Louisville area.
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Pollen forecast neighborhoods 13 neighborhoods
Sports venues in Louisville 8 sports venues
Frequently Asked Questions About Pollen in Kentucky
Is pollen high in Louisville right now?
On 20 September 2026, overall pollen levels in Louisville are high. Ambrosia is the main contributor to airborne pollen, while grass and artemisia remain at lower levels
Will pollen levels change in Louisville tomorrow?
On 21 September 2026, pollen conditions in Louisville will be different from today, with ambrosia, grass continuing to decline
Is pollen expected to decrease in Louisville this week?
According to the five-day outlook, ambrosia, artemisia, and grass pollen levels will increase later in the week.
Which pollen types are currently active in Louisville?
On 20 September 2026, Ambrosia is the dominant pollen source in Louisville. grass and artemisia are also present but at lower levels.
When is pollen season in Louisville?
How often is the Louisville pollen forecast updated?
The Louisville pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Louisville come from nearby or far away?
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.
Are pollen levels in Louisville based on measurements or forecasts?
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 Louisville, 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.
Understanding the Scale
The 0–100 scores represent risk levels, not direct measurements of pollen or air pollutant concentrations. Higher scores indicate higher risk. Pollen and air quality use different thresholds.
Pollen
| None | 0 | No or negligible risk of exposure. Pollen/mold exposure is expected to be minimal. |
| Low | 0-25 | Low risk of exposure. Small amounts of pollen or mold spores may be present. |
| Moderate | 25-50 | Moderate risk of exposure. Pollen/mold exposure is expected to be noticeable. |
| High | 50-75 | High risk of exposure. Elevated pollen/mold exposure is expected. |
| Very High | 75-100 | Very high risk of exposure. Pollen/mold exposure is expected to be at or near its highest levels. |
Get More in the Airmine Pollen app
Get 15-day pollen forecasts with morning, afternoon and evening detail, plus 5-day air quality forecasts. Explore interactive pollen risk maps, estimated pollen season start, route profiles and a symptoms diary.
Features and forecast availability vary by region. Currently covering Europe, the contiguous US, southern Canada, South Africa, Australia, Indonesia (Java & Bali), Brazil, Paraguay, Uruguay and the Buenos Aires area.
Developed with support from the European Space Agency (ESA) Business Applications and Space Solutions (BASS).
