Bulfinch Triangle, Boston Mold Forecast - Today, Tomorrow and the Week Ahead
Mold Today
Today (10 October) mold in Bulfinch Triangle, Boston is low; alternaria and cladosporium are low.
Mold Tomorrow
Tomorrow (11 October 2026) levels are similar to today.
7-Day Trend
Over the next week alternaria and cladosporium will decrease.
Explore Forecasts
Pollen & Air Quality
Mold for Neighborhoods
Get More in Our App
Local pollen and air quality forecasts, interactive pollen maps and route profiles
Features and forecast availability vary by region.
Mold Risk
Today - 10 October
| Mold species | Level | Value |
|---|---|---|
| Alternaria | Low | 4/100 |
| Cladosporium | Low | 12/100 |
Tomorrow - 11 October
| Mold species | Level | Value | 7-Day Trend |
|---|---|---|---|
| Alternaria | Low | 4/100 | Steady |
| Cladosporium | Low | 11/100 | Steady |
Local Mold Conditions
Organic material for mold is fairly limited around this location in Boston, found mostly in the green spaces among the buildings. Even in the developed parts, lawn clippings, flower beds and leaf piles give mold places to start. Shorelines collect washed-up plant material, which can harbor mold as it decays.
Cladosporium, the most common outdoor mold, grows on this plant material from April to October, peaking in July when temperatures average about 23°C. Alternaria follows a warmer pattern, rising from May to September and peaking in July. From December to March, temperatures below 5°C keep both molds at very low levels. Most spores are released on dry, windy afternoons after a damp night; steady rain clears the air.
Get pollen & AQ on Strava
Follow your environmental exposure and performance with the free Airmine-Strava integration. See your pollen and air quality exposure for every Strava activity.
Resource Hub
Mold forecast neighborhoods 80 neighborhoods
Sports venues in Boston 7 sports venues
Frequently Asked Questions About Mold in Massachusetts
Why do I still have allergy symptoms after the pollen season?
Allergy symptoms after the main pollen season may be caused by mold spores. Outdoor mold levels can remain high into late summer and autumn, when pollen levels are already falling. Mold allergy can cause symptoms similar to pollen allergy, including sneezing, a runny or blocked nose, itchy eyes, coughing, and wheezing.
What are mold spores and why do they cause allergies?
Mold spores are tiny particles released by fungi into the air. When inhaled, they can trigger an allergic reaction in sensitive people. Common symptoms include sneezing, a runny or blocked nose, itchy or watery eyes, coughing, and wheezing.
When are mold spore levels highest?
Outdoor mold spore levels often increase during warm and humid conditions, particularly when there is plenty of decaying vegetation. Levels can vary considerably with weather, season, vegetation, and location, and some types of mold are more common during particular times of the year, e.g. in the Fall.
How can I reduce my exposure to mold spores?
If you are sensitive to mold, check local mold spore levels and forecasts before spending long periods outdoors. On high-risk days, reducing time around dense vegetation, compost, fallen leaves, and other sources of decaying plant material may help limit exposure.
Understanding the Scale
The 0–100 mold scores represent risk levels, not direct mold measurements. Higher scores indicate higher risk.
Mold
| 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).
