Lyon, Valence et le Pays Roussillonnais sont les zones les plus touchées. L'indice se stabilise à Roussillon dans l'Isère mais demeure toujours préoccupant. Valence et Lyon augmentent sérieusement. Le pollens de l'Ambroisie atteind donc les grandes villes de la vallée du Rhône.
- Macon : 89
- Lyon : 313
- Bourgoin Jallieu : 744
- Roussillon : 1405
- Grenoble : 113
- Valence : 775
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