The German startup Breeze Technologies has launched one of the world’s densest air quality monitoring networks in the city of Hamburg. The company develops lower-cost air quality sensors and cloud software to visualize and analyze environmental data in real-time. With this project, Breeze Technologies aims to analyze and understand the connection between traffic flow and congestion, and urban air quality levels. Collected air quality data is publicly available. The project is supported by Microsoft’s “AI for Earth” program.