EPA, in collaboration with NASA, collected upward-viewing UV/visible solar radiance measurements at air quality stations in the New York City region. From these radiances, NO2 vertical column densities (molecules cm-2) are retrieved for comparison to retrieved NO2 column from a downward viewing, satellite-based UV/visible instrument, the NOAA Ozone Mapping and Profiler Suite (OMPS) . This dataset is associated with the following publication: Huang, X., K. Yang, S. Kondragunta, Z. Weir, L. Valin, J. Szykman, and M. Goldberg. NO2 retrievals from NOAA-20 OMPS: Algorithm, evaluation, and observations of drastic changes during COVID-19. ATMOSPHERIC ENVIRONMENT. Elsevier B.V., Amsterdam, NETHERLANDS, 290: 119367, (2022).