This is the post-processed mobile air monitoring data, with the methods described in the science journal publication. This dataset is associated with the following publication: Brantley, H., G. Hagler, S. Herndon, P. Massoli, M. Bergin, and A. Russell. Characterization of Spatial Air Pollution Patterns Near a Large Railyard Area in Atlanta, Georgia. International Journal of Environmental Research and Public Health. Molecular Diversity Preservation International, Basel, SWITZERLAND, 16(4): 535, (2019).