We convert raw pollen counts into a simple 1–10 Pollen Index so you can quickly gauge severity. The index normalises different thresholds for tree, grass, and weed pollen into one easy scale.
Tree pollen is one of the most common allergens in spring. Oak, birch, cedar, and maple are among the worst offenders.
Grass pollen peaks in late spring and early summer. Timothy, Bermuda, and Kentucky bluegrass are common triggers.
Weed pollen dominates late summer and fall. Ragweed is the most widespread trigger, affecting millions each year.
Allergy season looks different depending on the pollen type. Tree pollen peaks in early spring, grass follows in late spring, and weed pollen dominates late summer into fall.
Pollen Predictor uses hyper-local atmospheric data to give you an accurate picture of pollen conditions in your area. Instead of relying on regional averages, we analyze station-level measurements and weather patterns that affect how pollen disperses hour by hour.
Over 80 million Americans suffer from seasonal allergies. Knowing exactly when pollen levels spike — and which type of pollen is responsible — helps you take the right precautions at the right time, whether that means adjusting your morning routine or choosing the best day for outdoor activities.