Weed pollen
Weeds carry the late-summer and fall pollen season, led by ragweed. 4 guides, each with its sources.
Today across our metrosHighest level in any metro, and how many metros reach it
Source: Includes pollen data from GoogleIncludes data from Google Maps
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AmbrosiaRagweedRagweed is a native weed whose wind-borne pollen causes late-summer and fall hay fever in most of the US. One plant can produce up to a billion grains.ArtemisiaSagebrushSagebrush is an aromatic shrub of the western US whose wind-borne pollen adds to late-summer and fall hay fever. Its pollen allergens closely match those of mugwort.AmaranthusPigweedPigweeds are weedy amaranths that shed wind-borne pollen from summer into fall. Their pollen is reported to cross-react with that of lamb’s quarters and Russian thistle.Plantago lanceolataEnglish plantainEnglish plantain is a weed of lawns, pastures and roadsides whose pollen can cause hay fever. It is not the banana-like fruit also called plantain.