Historique du pollen "Bouleau" pour l'année actuelle
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| Dinan |
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| Lorient |
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| Pontivy |
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| Rennes |
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| St-Brieuc |
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| Semaine | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 |
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| Risque nul | Risque faible | Risque moyen | Risque fort | Pas d'information |