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Gathering pollen, air quality, and weather data for you.
Gathering pollen, air quality, and weather data for you.
Pollen Level
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Air Quality
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Cambridge's allergy season typically runs from March through October, with two distinct peaks. Tree pollen surges in spring, then ragweed takes over in late summer. Understanding these patterns helps residents of Cambridge, MA plan outdoor activities and manage symptoms.
Right now: July sees grass pollen tapering off in Cambridge, but humidity can boost mold spore counts indoors and out.
Spring
Mar – May
Oak, birch, and maple tree pollen peak. Highest risk in April–May.
Summer
May – Jul
Grass pollen dominates. Humid days can elevate mold spore counts.
Fall
Aug – Oct
Ragweed season. Second major peak for allergy sufferers.
Coastal breezes near Cambridge can provide temporary relief, but spring nor'easters often redistribute pollen across wide areas. PollenTracker monitors these daily shifts so you know when it's safe to head outside.
Open another nearby forecast without going back to the map.
CAUTION
Limit exposure
Grass pollen is high and 15 mph wind is stirring it up. If you need to be outside, aim for the safest window later in the day.
Pollen: Grass pollen is high today at 120 grains/m³.
Lower-risk hours: 11:00, 19:00, 21:00
Weather
88°F
Partly Cloudy · 50% humidity · 15 mph wind
~5 grains/m³
~5 grains/m³