Upper Arlington pollen forecast — Upper Arlington Historic District neighborhood
Pollen Today
Today (20 September) pollen in Upper Arlington Historic District, Upper Arlington is high; grass and ragweed are high; 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) | High | 56/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Low | 22/100 |
| Ragweed (Ambrosia) | High | 66/100 |
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) | Low | 22/100 |
Local Environmental Conditions
Located roughly 500-600m away, this area has the riverbank shelters hazel and willow, two trees whose pollen travels readily on the breeze. Here, at around 500-600m distant, a wooded stretch of oak and birch, with birch responsible for some of the sharpest spring counts. Here, a comfortable 350 meters away, a green space where lawn grass and ornamental plantings top up the local grass and ragweed count.
Water-edge hazel and willow are usually the first allergenic trees active here, starting well before the main spring rush, topping out around March. The nearby oak and birch stands take the lead as spring progresses, typically the year's sharpest tree-pollen spell, centered on April and May. Late spring sees grass pollen build steadily toward a peak in June, and then ragweed picks up the slack, running from mid-August through October.
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Pollen forecast neighborhoods 12 neighborhoods
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Frequently Asked Questions About Pollen in Ohio
Is pollen high in Upper Arlington right now?
On 20 September 2026, overall pollen levels in Upper Arlington are high. Grass is the main contributor to airborne pollen, while ambrosia and artemisia remain at lower levels
Will pollen levels change in Upper Arlington tomorrow?
On 21 September 2026, pollen conditions in Upper Arlington will be different from today, with grass, ambrosia continuing to decline
Is pollen expected to decrease in Upper Arlington 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 Upper Arlington?
On 20 September 2026, Grass is the dominant pollen source in Upper Arlington. ambrosia and artemisia are also present but at lower levels.
When is pollen season in Upper Arlington?
How often is the Upper Arlington pollen forecast updated?
The Upper Arlington pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Upper Arlington 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 Upper Arlington 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 Upper Arlington, 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).
