This dataset provides black carbon (BC) mass mixing ratios (in units of ng BC / kg air) measured during NASA's Atmospheric Tomography (ATom)-1 flight campaign during July and August 2016. The BC ratios were measured by the Single Particle Soot Photometer (SP2) and Particle Analysis by Laser Mass Spectrometry (PALMS) instruments. Included here are also associated latitude, longitude, altitude, and the timestamp of each measurement. We also include data from the cloud aerosol spectrometer (CAS) instrument in order to identify measurements taken while in clouds and BC vs. dust differentiation. All data are at ten seconds resolution. ATom-1 flights originated from the Armstrong Flight Research Center in Palmdale, California, fly north to the western Arctic, south to the South Pacific, east to the Atlantic, north to Greenland, and return to California across central North America.