PM10: dust, pollen, and the coarse fraction
Larger particles that mostly get filtered in the upper airway, but they still matter for allergies, asthma, and visibility.
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Pollen and ozone: the outdoor numbers that change your indoor advice
When outdoor ozone or pollen is high, "open a window" stops being good advice.
Pollen species: the six that matter most
Alder, birch, grass, mugwort, olive, ragweed: European pollen forecasts track each separately, and the seasons are very different. Terrestream's pollen levels come from Google.
Tree pollens, regional
A short list of headline genera covers the broad strokes, but tree pollens vary by region. Oak in the South, cedar in Texas, maple in the Northeast, birch in the North.
Mold spore forecasts
Outdoor mold spore counts are tracked alongside pollen by allergy services. Different biology, often confused, sometimes the actual culprit when pollen seems low.
