Data for: Automotive braking is a source of highly charged aerosol particles

Although the last several decades have seen a dramatic reduction in emissions from vehicular exhaust, non-exhaust emissions (e.g., brake and tire wear) represent an increasingly significant class of traffic-related particulate pollution. Aerosol particles emitted from the wear of automotive brake pads contribute roughly half of the particle mass attributed to non-exhaust sources, while their relative contribution to urban air pollution overall will almost certainly grow, coinciding with vehicle fleet electrification and the transition to alternative fuels. To better understand the implications of this growing prominence, a more thorough understanding of the physicochemical properties of brake wear particles (BWPs) is needed. Here we investigate the electrical properties of BWPs as emitted from ceramic and semi-metallic brake pads. We show that up to 80% of BWPs emitted are electrically charged, and demonstrate a dependence of charge state on particle size and charge polarity. We find th..., Please refer to the following manuscript: Thomas, A. E., Bauer, P. S., Dam, M., Perraud, V., Wingen, L. M., and Smith, J. N.: Automotive braking is a source of highly charged aerosol particles, Proc. Natl. Acad. Sci., 2023, submitted. , All files are comma-delimited text files, and can be opened by any software that is capable of reading comma-delimited files such as Excel. Numerical values that are absent from a table are indicated by \"NaN\" (\"Not a Number\").Â