Grayslake pollen forecast — Downtown neighborhood
Pollen Today
Today (20 September) pollen in Downtown, Grayslake is moderate; ragweed is moderate; grass and mugwort are low.
Pollen Tomorrow
Tomorrow (21 September 2026) grass remains low, ragweed remains moderate, 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) | Low | 19/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Low | 1/100 |
| Ragweed (Ambrosia) | Moderate | 41/100 |
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) | Moderate | 29/100 |
Local Environmental Conditions
Downtown — Here, within easy reach at 286m, hazel and willow thrive along the damp bank, both prolific early wind-pollinators. Woods composed largely of oak and birch, a combination tied to sharp spring pollen spikes, close by, around 559 meters away. Located positioned about 328m from the neighborhood, this area has a park whose turf grass and ornamental plantings feed local grass and ragweed pollen levels.
Near the bank, hazel and willow lead the seasonal calendar, building through the tail end of winter into March. Woodland oak and birch pick up the pace next, through mid-to-late spring, topping out in the April-to-May stretch. Grass pollen rises through late spring toward a June high point, and ragweed later takes the lead from mid-August through October.
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Pollen forecast neighborhoods 5 neighborhoods
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Frequently Asked Questions About Pollen in Illinois
Is pollen high in Grayslake right now?
On 20 September 2026, overall pollen levels in Grayslake are moderate. Ambrosia is the main contributor to airborne pollen, while artemisia and grass remain at lower levels
Will pollen levels change in Grayslake tomorrow?
On 21 September 2026, pollen conditions in Grayslake will be different from today, with grass at low levels, ambrosia at moderate levels
Is pollen expected to decrease in Grayslake 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 Grayslake?
On 20 September 2026, Ambrosia is the dominant pollen source in Grayslake. artemisia and grass are also present but at lower levels.
When is pollen season in Grayslake?
How often is the Grayslake pollen forecast updated?
The Grayslake pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Grayslake 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 Grayslake 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 Grayslake, 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).
