Data Files for measurements in Accurate representations of the physicochemical properties of atmospheric aerosols: when are laboratory measurements of value? Aleksandra Marsh,a Grazia Rovelli,a Young-Chul Song,a Kelly L. Pereira,b Rose E. Willoughby,a Bryan R. Bzdek,a Jacqueline F. Hamilton,b Andrew J. Orr-Ewing,a David O. Topping*c and Jonathan P. Reid*a a School of Chemistry, University of Bristol, BS8 1TS, UK b Wolfson Atmospheric Chemistry Laboratories, Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK c School of Earth, Atmospheric and Environmental Science, University of Manchester, Manchester M13 9PL, UK Correspondence to: Jonathan. P. Reid j.p.reid@bristol.ac.uk File types are File which can be opened using excel, wordpad or notepad. Figure 1.csv etc files All data are saved with names according to the numbering fo the figures in the published manuscript and are in CSV format (can be read by any operating system). No additional software is required. All data files contain self-explanatory column headings.