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Description
The OMI science team produces this Level-3 Aura/OMI Global OMSO2e Data Products (0.25 degree Latitude/Longitude grids). In this Level-3 daily global SO2 data product, each grid contains only one observation of Total Column Density of SO2 from the GEOS-5 profile, based on an improved Principal Component Analysis (PCA) Algorithm. This single observation is the "best pixel", selected from all "good" L2 pixels of OMSO2 that overlap this grid and have UTC time between UTC times of 00:00:00 and 23:59:59.999. In addition to the SO2 Vertical column value some ancillary parameters, e.g., cloud fraction, terrain height, scene number, solar and satellite viewing angles, row anomaly flags, and quality flags have been also made available corresponding to the best selected SO2 data pixel in each grid.
The OMSO2e files are stored in the version 5 EOS Hierarchical Data Format (HDF-EOS5) using the grid model.
Goddard Earth Sciences Data and Information Services Center (formerly Goddard DAAC), Terrestrial Information Systems Laboratory, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA (NASA/GSFC/SED/ESD/TISL/GESDI
Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.
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Krotkov, N. A., Li, C., & Leonard, P. (2025). OMI/Aura Sulfur Dioxide (SO2) Total Column Daily L3 1 Day Best Pixel in 0.25 degree x 0.25 degree [Data set]. NASA Goddard Earth Sciences Data and Information Services Center. https://doi.org/10.5067/AURA/OMI/DATA3408 Date Accessed: 2026-06-01
Krotkov, Nickolay A., Can Li, and Peter Leonard. “OMI/Aura Sulfur Dioxide (SO2) Total Column Daily L3 1 Day Best Pixel in 0.25 Degree x 0.25 Degree.” NASA Goddard Earth Sciences Data and Information Services Center, 2025. doi:10.5067/AURA/OMI/DATA3408. Date Accessed: 2026-06-01
Krotkov, Nickolay A., et al. OMI/Aura Sulfur Dioxide (SO2) Total Column Daily L3 1 Day Best Pixel in 0.25 Degree x 0.25 Degree. NASA Goddard Earth Sciences Data and Information Services Center, 2025, doi:10.5067/AURA/OMI/DATA3408. Date Accessed: 2026-06-01
He, Hao, Vinnikov, Konstantin Y., Li, Can, Krotkov, Nickolay A., Jongeward, Andrew R., Li, Zhanqing, Stehr, Jeffrey W., Hains, Jennifer C., Dickerson, Russell R.
Streets, David G., Canty, Timothy, Carmichael, Gregory R., de Foy, Benjamin, Dickerson, Russell R., Duncan, Bryan N., Edwards, David P., Haynes, John A., Henze, Daven K., Houyoux, Marc R., Jacob, Daniel J., Krotkov, Nickolay A., Lamsal, Lok N., Liu, Yang, Lu, Zifeng, Martin, Randall V., Pfister, Gabriele G., Pinder, Robert W., Salawitch, Ross J., Wecht, Kevin J.