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Giant Ragweed Pollen

Weeds

The largest ragweed species, growing up to 5 metres. Found in floodplains and agricultural areas of North America. Highly allergenic.

Season August to October
Peak September

In a typical year, Giant Ragweed Pollen season runs August to October, peaking around September.

Where is Giant Ragweed Pollen highest today?

Live ranking across the cities we track, from today's forecast. Updated daily.

LocationsLevelCount
Sarajevo · Bosnia and HerzegovinaX.HI704 grains/m³
Lyon · FranceX.HI689 grains/m³
Tirana · AlbaniaX.HI587 grains/m³
Grenoble · FranceX.HI523 grains/m³
Geneva · SwitzerlandX.HI497 grains/m³
Skopje · North MacedoniaX.HI493 grains/m³
Chișinău · MoldovaX.HI424 grains/m³
Bratislava · SlovakiaX.HI417 grains/m³
Belgrade · SerbiaX.HI396 grains/m³
Montpellier · FranceX.HI328 grains/m³

Giant Ragweed Pollen season by country

Typical windows from our country pollen calendars; the weather shifts them earlier or later each year.

CountrySeasonPeak
JapanAug–OctAug–Sep
United StatesJul–OctAug–Sep