This dataset contains 3 minute resolution data with measurements from the SMPS (SMPS – TSI 3080 Classifier) and Condensation Particle Counters (CPC3787, CPC3782 and CPC3772). The SMPS gives the size distribution and the CPC gives the total particle number concentration. The number following the X is the midpoint diameter of the SMPS size bin, in nm. For instance, X11.3 denote the size bin with a diameter midpoint of 11.3 nm. As not all the CPCs were available to be used at all times, a linear model was used to model the total particle number concentration based off measurements from the three CPCs.