The third K-HEALTHinAIR webinar, “Indoor Air Quality in Schools: From Pilot Experience to Policy Action”, had a specific focus on school environments. As children spend a significant part of their day in classrooms, the webinar explored how indoor air quality can affect health, wellbeing, attention and learning conditions. The session brought together insights from the K-HEALTHinAIR Austrian and Polish pilots, contributions from the SynAir-G project, and reflections from the IDEAL Cluster on children’s health and policy needs for healthier school environments.