Plainfield, New Jersey pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Plainfield, New Jersey is moderate; grass and ragweed are moderate; mugwort is low.
Pollen Tomorrow
Tomorrow (21 September 2026) grass remains moderate, ragweed remains moderate, mugwort no longer expected.
7-Day Trend
Over the next week grass and mugwort will increase; ragweed will decrease.
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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 | 35/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Low | 1/100 |
| Ragweed (Ambrosia) | Moderate | 46/100 |
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) | Moderate | 30/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | None | 0/100 | |
| Ragweed (Ambrosia) | Moderate | 40/100 |
Local Environmental Conditions
Plainfield's Union County suburban setting in the greater New York metropolitan area features oak, maple, and sweetgum as the main tree pollen sources, with the dense residential tree canopy and Watchung Reservation's wooded ridgeline shaping local exposure. The Mid-Atlantic climate produces a pronounced spring tree pollen peak, while ragweed and grass pollen extend the season into early autumn.
Plainfield's northeastern Illinois Chicago suburban setting produces a season opening in late March with elm and maple before oak peaks through May. Grass from surrounding Illinois farmland peaks through June and July before mugwort and nettle extend exposure into September. The DuPage River corridor channels airflows, while the flat Midwest landscape allows pollen to disperse widely throughout the season.
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Frequently Asked Questions About Pollen in New Jersey
Is pollen high in Plainfield, New Jersey right now?
On 20 September 2026, overall pollen levels in Plainfield, New Jersey are moderate. Ambrosia is the main contributor to airborne pollen, while grass and artemisia remain at lower levels
Will pollen levels change in Plainfield, New Jersey tomorrow?
On 21 September 2026, pollen conditions in Plainfield, New Jersey will be different from today, with ambrosia at moderate levels, grass at moderate levels
Is pollen expected to decrease in Plainfield, New Jersey this week?
According to the five-day outlook, ambrosia pollen levels are expected to gradually decrease, while artemisia and grass pollen will increase, suggesting mixed conditions later in the week.
Which pollen types are currently active in Plainfield, New Jersey?
On 20 September 2026, Ambrosia is the dominant pollen source in Plainfield, New Jersey. grass and artemisia are also present but at lower levels.
When is pollen season in Plainfield, New Jersey?
How often is the Plainfield, New Jersey pollen forecast updated?
The Plainfield, New Jersey pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Plainfield, New Jersey 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 Plainfield, New Jersey 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 Plainfield, New Jersey, 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. |
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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).
