With the Smart City project 'WAS sweeps smart?!', we are using sensors sensibly to keep our city clean. A sweeper from Wolfsburg Waste Management and Street Cleaning (WAS) has been fitted with a sensor and can now collect data on the amount and type of waste in the city area during its journeys. The collected data is then used to create a digital heat map that shows where waste is more prevalent. This makes it possible to identify focal points of pollution and derive targeted measures to improve urban cleanliness.