feat: pollen module — MeteoSwiss real-time pollen concentrations

[agent-heidi]

What

Add a new Pollen module using MeteoSwiss open data from the national pollen monitoring network (16 automatic stations).

API

• STAC Collection: https://data.geo.admin.ch/api/stac/v1/collections/ch.meteoschweiz.ogd-pollen
• Data files: CSV per station at https://data.geo.admin.ch/ch.meteoschweiz.ogd-pollen/{station}/ogd-pollen_{station}_{granularity}_{period}.csv
• Station metadata: https://data.geo.admin.ch/ch.meteoschweiz.ogd-pollen/ogd-pollen_meta_stations.csv
• Parameter metadata: https://data.geo.admin.ch/ch.meteoschweiz.ogd-pollen/ogd-pollen_meta_parameters.csv
• Auth: None (zero API keys, Source: MeteoSwiss required)
• License: Open Data, source must be cited

Stations (16)

Bern, Basel, Buchs SG, La Chaux-de-Fonds, Davos, Geneve, Jungfraujoch, Locarno, Lausanne, Lugano, Luzern, Munsterlingen, Neuchatel, Payerne, Sion, Zurich

Pollen types (7)

Alder (Alnus), Birch (Betula), Hazel (Corylus), Beech (Fagus), Ash (Fraxinus), Oak (Quercus), Grasses (Poaceae)

Data granularities

• h (hourly) — real-time, updated every hour
• d (daily) — daily averages
• y (yearly) — annual integrals

Proposed Tools (3)

Tool	Description
get_pollen_current	Current pollen levels at a station (latest hourly data). Returns concentration per pollen type.
get_pollen_daily	Daily pollen averages for a station over recent days. Good for trend analysis.
list_pollen_stations	List all 16 pollen monitoring stations with location, canton, coordinates.

Use Cases

• "What's the pollen situation in Zurich right now?" -> Alder 106, Oak 93 pollen/m3
• "Is birch pollen high in Basel this week?"
• "Which stations have the lowest grass pollen right now?"
• "Pollen trend in Bern over the last 7 days?"

Impact

• New module: pollen (3 tools)
• Total: 76 -> 79 tools, 21 -> 22 modules
• Highly seasonal and practical — affects ~20% of Swiss population (hayfever)

Attribution

Data source: MeteoSwiss (Source must be cited)