O'Dell, KatelynFord, BonneFischer, Emily V.Pierce, Jeffrey R.2021-04-192021-04-192021https://hdl.handle.net/10217/230602https://doi.org/10.25675/10217/230602http://dx.doi.org/10.25675/10217/230602US Environmental Protection Agency. Air Quality System Data Mart [internet database] available at http://www.epa.gov/ttn/airs/aqsdatamart. Accessed 15 January 2021.This dataset contains an updated version of spatially interpolated daily PM2.5 concentrations observed by monitors in the Environmental Protection Agency's Air Quality System and non-smoke seasonal background PM2.5 estimates for 2006-2018. See the readme file for details on data processing and recommended usage.This dataset is an updated version of a previously published dataset: https://dx.doi.org/10.25675/10217/193258 and https://doi.org/10.25675/10217/208602.Department of Atmospheric ScienceTXTPDFShapefileNetCDFengair qualitywildfire smokePM2.5Dataset