Does anyone know what is meant by the negative values in Sentinel-5p Aerosol index data. I'm working on air quality monitoring and very new to using Sentinel-5p products.
Thanks in advance
In the same way I am interested in the answer. But also speaking of NO2 and SO2
Positive values of Aerosol Index generally represent absorbing aerosols (dust and smoke) while small or negative values represent non-absorbing aerosols and clouds. Refer to the domunetation for more details: https://disc.gsfc.nasa.gov/information/glossary?title=Aerosol%20Index
For SO2l, negative values represent over clean region or low pollutant emission. SO2 it is recommended not to filter these values except for outliers, i.e. for vertical columns lower than -0.001 mol/m^2. Again, please refer to the data user guide for better understanding and more details: https://sentinel.esa.int/documents/247904/3541451/Sentinel-5P-Sulphur-Dioxide-Readme.pdf
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