Health Surveillance in Brittany. Bulletin of September 5, 2025.

Key Points

Heat-related illnesses

  • The region has experienced three periods of extreme heat since the start of the seasonal monitoring period: around June 20 (S25), around June 30 (S26-27), and in mid-August (S33). Brittany has been under a green heat wave alert since August 18.

Allergies

  • Decrease in emergency room visits among adults.

Back-to-school asthma

  • The number of emergency room visits and SOS Médecins consultations is low in August, as is typically observed at this time of year, ahead of the start of the school year.

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