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Daily measurements from 2012 onward provide global coverage of atmospheric sulfur dioxide (SO2) columns. Data are collected by the OMPS Nadir-Mapper sensor on the Suomi-NPP satellite and processed using a principal component analysis (PCA) spectral fitting algorithm. The product is gridded at a 0.25 x 0.25 degree resolution using a 'best pixel' method for the daylight portion of each orbit.
Files are in netCDF4 format, which requires specific software libraries for access and analysis. License details are unspecified beyond 'other-license-specified'.