The particle number size distribution from 1.5 – 800 nm was collected at a roadside site, and the particle number size distribution from 3 – 800 nm was collected at an urban background site in Leipzig, Germany. Concentrations of oxygenated organic molecules and strong acids were also collected using a nitrate chemical ionization atmospheric pressure interface time of flight mass spectrometer. The data span one month in August 2022. The site names are TROPOS and EIBA.