Hanover, New Hampshire Pollen Forecast - Today, Tomorrow and the Week Ahead
Pollen Today
Today (10 October) pollen in Hanover, New Hampshire is low; mold (alternaria) and mold (cladosporium) are low.
Pollen Tomorrow
Tomorrow (11 October 2026) mold (alternaria) remains low, mold (cladosporium) remains low, mugwort at low levels, ragweed at low levels.
7-Day Trend
Over the next week mugwort and ragweed will increase; mold (alternaria) and mold (cladosporium) will decrease; grass will remain stable.
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Pollen Risk
Today - 10 October
| 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) | None | 0/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | None | 0/100 |
| Ragweed (Ambrosia) | None | 0/100 |
| Mold (Alternaria) | Low | 3/100 |
| Mold (Cladosporium) | Low | 15/100 |
Tomorrow - 11 October
| 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) | None | 0/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | Low | 5/100 | |
| Ragweed (Ambrosia) | Low | 8/100 | |
| Mold (Alternaria) | Low | 5/100 | |
| Mold (Cladosporium) | Low | 17/100 |
Local Environmental Conditions
The area around the heart of Hanover is mostly woodland, with a good deal of built-up land. With the Connecticut River nearby, riverside trees such as poplar along its banks contribute to the local mix. The leading allergenic tree nearby is maple, with birch and oak close behind. Grass pollen is plentiful, while mugwort and ragweed lead among the weeds.
Maple, birch and oak lead the season in mid-spring, as temperatures climb to around 5°C, and tree pollen reaches its peak. Grasses take over in early summer, with temperatures around 20°C, and their pollen lingers into late summer. Later, mugwort and ragweed keep weed pollen in the air from midsummer into early fall. In warm, humid weather through summer, mold spores add to the mix, especially after rain.
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Frequently Asked Questions About Pollen in New Hampshire
Is pollen high in Hanover, New Hampshire right now?
Currently, there is no significant pollen in Hanover, New Hampshire.
Will pollen levels change in Hanover, New Hampshire tomorrow?
On 11 October 2026, pollen conditions in Hanover, New Hampshire will be different from today, with ambrosia at low levels, artemisia at low levels
Is pollen expected to decrease in Hanover, New Hampshire this week?
According to the five-day outlook, ambrosia and artemisia pollen levels will increase later in the week.
Which pollen types are currently active in Hanover, New Hampshire?
On 10 October 2026, there are no significant pollen types in Hanover, New Hampshire.
When is pollen season in Hanover, New Hampshire?
How often is the Hanover, New Hampshire pollen forecast updated?
The Hanover, New Hampshire pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Hanover, New Hampshire 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 Hanover, New Hampshire 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 Hanover, New Hampshire, 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 pollen scores represent risk levels, not direct pollen measurements. Higher scores indicate higher risk.
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).
