get a daily pollen forecast and heatmap tiles from the google pollen api
domain: pollen.googleapis.com · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Create/select a Google Cloud project, enable billing, enable the Pollen API, and generate an API key in Cloud Console
Send GET https://pollen.googleapis.com/v1/forecast:lookup?key=YOUR_API_KEY&location.latitude={lat}&location.longitude={lon}&days={1-5}
Read dailyInfo[].pollenTypeInfo[] (GRASS/TREE/WEED) and plantInfo[] for per-species Universal Pollen Index (UPI, 0-5 scale), inSeason flag, and healthRecommendations
If using a small pageSize across multiple days, follow the returned nextPageToken to page through subsequent days
For a map overlay, fetch PNG tiles from GET https://pollen.googleapis.com/v1/mapTypes/{TYPE}/heatmapTiles/{Z}/{X}/{Y}?key=YOUR_API_KEY (e.g. TYPE=TREE_UPI)
Known gotchas
Forecast coverage is limited to a specific list of countries/regions, and within many of them only grass pollen is tracked — check the coverage table before assuming tree/weed data exists for a country
Like the Air Quality API, requires a Google Cloud project with billing enabled and an API key from Cloud Console — no separate free-standing signup
indexInfo is omitted from the response for a pollen type/plant that is out of season with a low count, so code must not assume every type/plant object always carries a UPI value
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