Greenhills pollen forecast — Greenhills Historic District neighborhood
Pollen Today
Today (20 September) pollen in Greenhills Historic District, Greenhills is moderate; grass and ragweed are 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 | 38/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Low | 11/100 |
| Ragweed (Ambrosia) | Moderate | 43/100 |
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 | 7/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | None | 0/100 | |
| Ragweed (Ambrosia) | Low | 11/100 |
Local Environmental Conditions
This area, some 450 meters out, has hazel and willow take root along the waterway, both prolific contributors to early pollen counts. The tree cover here leans heavily on oak and birch, both key drivers of spring pollen, a short 50 meters out. A park where mown turf grass and ornamental trees add grass and ragweed pollen; this sits practically next door, 50 meters off.
Along the waterway, hazel and willow release pollen first, leading off the pollen calendar, with a peak generally falling in late winter. The area's oak and birch trees pollinate through mid-to-late spring, usually hitting its highest point sometime between mid-April and mid-May. Grass pollen takes over next, building to a peak around June, before ragweed pollen takes center stage across mid-August into October.
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Resource Hub
Pollen forecast neighborhoods 1 neighborhood
Sports venues in Greenhills 1 sports venue
Frequently Asked Questions About Pollen in Ohio
Is pollen high in Greenhills right now?
On 20 September 2026, overall pollen levels in Greenhills are moderate. Grass is the main contributor to airborne pollen, while ambrosia and artemisia remain at lower levels
Will pollen levels change in Greenhills tomorrow?
On 21 September 2026, pollen conditions in Greenhills will be different from today, with grass, ambrosia continuing to decline
Is pollen expected to decrease in Greenhills this week?
According to the five-day outlook, artemisia, grass, and ambrosia pollen levels will increase later in the week.
Which pollen types are currently active in Greenhills?
On 20 September 2026, Grass is the dominant pollen source in Greenhills. ambrosia and artemisia are also present but at lower levels.
When is pollen season in Greenhills?
How often is the Greenhills pollen forecast updated?
The Greenhills pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Greenhills 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 Greenhills 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 Greenhills, 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).
