<< Objectives >>CHANGE aims at developing a STEM pathway centered on Indoor Air Quality (IAQ) in schools. The project partners are an Italian Research Institute (Proambiente) and four VET secondary schools (from Bulgaria, Italy, Romania and Spain). The main objective is providing students with digital skills (system integration, programming and data processing) functional to match the labour market demand, and raising their awareness on topics like IAQ monitoring, energy efficiency, raw materials and open data.<< Implementation >>- Development of modular, interactive, digital and inclusive (MIDI) didactic material consisting of a theoretical section on IAQ and climate changes, a practical section on the assembly of open-source CO2 monitoring stations and their usage for experiments and continuous indoor monitoring.- Training of the VET teachers and students to acquire multidisciplinary IAQ competences.- IAQ best practices and guidelines draft and dissemination activities towards the decision makers and citizens.<< Results >>The main project result will be to create STEM IAQ competences in 400 VET students (Bulgarian, Italian, Romanian and Spanish).CHANGE will create reliable and optimized resources (MIDI didactic pathway, monitoring stations, tools for open data visualization and management) and implement dissemination actions fostering awareness on IAQ.Moreover, IAQ guidelines and best practices for the management of indoor scholastic spaces will be produced using the data collected from 100 monitoring stations.