Pollen Zones
Pollen counts vary from region to region in the U.S. Use the pollen zone map to determine when tree, grass and weed pollens are at their worst in your area.
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Hide CaptionShow CaptionSouthwest Pollen MapAll About
Trees: February to June
Grasses: April to October
Weeds: February to October
Grasses: April to October
Weeds: February to October
Find out which plants may be making you sneeze: Allergenic Plants
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