Cloud condensation number concentration was measured using a Cloud Condensation Nuclei Counter (CCN100, Droplet Measurement Technologies, Longmont, Colorado, USA). Measurements were taken at Cataract Scout Park, Appin, N.S.W. (34°14'42.29"S 150°49'24.97"E) from an inlet 5.13 m above ground level as part of the Characterizing Organics and Aerosol Loading over Australia (COALA-2020) campaign. The instrument was operated for the majority of the campaign at either 0.2% supersaturation or 0.5% supersaturation, with occasional measurements made at 1.0% supersaturation. Periods when zero and flow checks were carried out have been removed from the published measurements, presented at 1-hour temporal resolution. Data presented are hourly averages of the 1 Hz measurements output by the instrument. Hourly standard deviations are also reported generated from time-averaging of the measurements, and data at finer temporal resolution are available on request.

Empty cells = ndCOALA-2020 was funded by Australia's National Environmental Science Program through the Clean Air and Urban Landscapes hub