Air quality measurements in Stuttgart are performed under the project Urban Climate Under Change [UC]² Bicycle measurements provide the spatial distribution of meteorological parameters and air pollutants including UFP, while the balloon measurements provide the vertical profiles of the same parameters • The mobile measurements were carried out during summer and winter period of 2018 • As part of the quality assurance of the measured data, the gas devices were calibrated regularly using a gas phase titration system • PM, UFP and BC measurement devices were compared in advance with calibrated devices and also with the stationary monitoring stations