Flow is a personal air pollution sensor – a companion to explain what is in the air. The sensor and its connected app give a minute-by-minute breakdown of the pollutants the users are exposed to throughout their day by measuring real-time concentrations of NO₂, VOC, PM₂.₅ and PM₁₀. Flow is designed to be a tool to connect, and a tool to empower. Users help crowdsource air pollution levels across their city, empowering others to breathe cleaner air and supporting healthier communities worldwide.