Why Tree Species Matters
The pollen count on your weather app combines all pollen types into one number. A count of 300 grains/m³ might be 80% pine pollen (low allergenicity) or 80% oak pollen (highly allergenic for roughly 25% of the population). The number alone doesn't tell you what you need to know.
Anthos breaks your daily count down by species so you know exactly what you're facing — not just how much pollen is in the air.
The 8 Most Allergenic Trees in the US
Oak — The Spring Season's Dominant Allergen
Oak is the most widespread and allergenic tree in the eastern United States. There are over 600 species in the US, and most release highly allergenic pollen from March through May. Oak pollen is small, light, and travels significant distances — it can appear in your readings even without oak trees nearby.
Mountain Cedar — "Cedar Fever" in Texas
Mountain cedar produces what Texans call "cedar fever" — a violent allergic reaction severe enough to mimic influenza. It's one of the only major pollen seasons running through December and January. If you're new to Texas and getting "sick" every winter, cedar is almost certainly the culprit.
Birch — The Northeast's Primary Spring Allergen
Among the most allergenic trees in the world. Birch pollen is also associated with oral allergy syndrome — birch-allergic people often experience tingling when eating raw apples, cherries, peaches, and certain nuts. Unexplained fruit reactions in spring are often birch-related.
Elm — The Early-Season Surprise
Elm blooms before it leafs out — which means you can walk past a bare, seemingly dormant tree that is actively releasing pollen. Elm starts as early as February and catches many allergy sufferers off guard before they've begun seasonal precautions.
Alder — The Pacific Northwest's Dominant Allergen
Alder dominates the Pacific Northwest in a way that oak dominates the East. It begins as early as January and produces copious, highly allergenic pollen. Seattle residents often describe February as their worst allergy month — alder is why.
Pine — High Volume, Low Impact
Pine pollen is the most visible — the yellow coating on cars in spring is almost entirely pine. Despite the visual drama, pine pollen is one of the least allergenic tree pollens. Its grains are large and heavy, settle quickly, and rarely reach upper airways. Most people experience relatively mild symptoms on high-count pine days.
Know which tree is hitting you today.
Anthos breaks down your daily pollen count by species — not just a total number. Know whether today's count is pine (manageable) or oak (plan accordingly) before you step outside.
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Anthos provides general wellness information only. Nothing in this article constitutes medical advice, diagnosis, or treatment. Always consult a licensed healthcare professional before making health decisions.