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Deux niveaux réglementaires sont définis :
- niveau de recommandation et d'information au-delà duquel une exposition de courte durée présente un risque pour la santé humaine de personnes sensibles et qui requiert la diffusion de recommandations sanitaires et comportementales.
- niveau d'alerte au-delà duquel une exposition de courte durée présente un risque pour la santé de l'ensemble de la population ou un risque pour la dégradation de l'environnement et qui conduit à la mise en œuvre de mesures d'urgence en complément des recommandations sanitaires et comportementales. 

Les épisodes sont prévus quotidiennement pour le jour-même (J) et le lendemain (J+1) à partir d'une analyse locale des données de prévisions , de prévisions météorologiques expertisées et de concentrations mesurées sur le réseau de stations d'Atmo Nouvelle-Aquitaine.

Deux polluants sont intégrés dans la procédure de déclenchement d'épisode de pollution sur prévision : 
- particules fines (PM10)
- ozone (O3)

Le niveau d'alerte peut également être activé sur persistance pour le lendemain (J+1) lorsque le niveau de recommandation et d'information est prévu pour le jour-même (J) et le lendemain (J+1).

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