Data products

UV Aerosol Index


The Aerosol Index (AI) is a well-established data product that has been calculated for several different satellite instruments spanning a period of nearly 40 years. The S5P/TROPOMI aerosol index is referred to as the Ultraviolet Aerosol Index (UVAI). The relatively simple calculation of the Aerosol Index is based on wavelength dependent changes in Rayleigh scattering in the UV spectral range where ozone absorption is very small. UVAI can also be calculated in the presence of clouds so that daily, global coverage is possible. This is ideal for tracking the evolution of episodic aerosol plumes from dust outbreaks, volcanic ash, and biomass burning. The figure below shows the S5P/TROPOMI UVAI averaged for May 2018, Saharan and dust belt plumes are most visible, however smaller sources can also be seen in North and South America . 

Data product version summary (click current version number for the latest PRF).
Version number Version Effective Date Summary of Changes


Next planned update



NRTI: 2018-07-04 (orbit 03745) to present

OFFL: 2018-06-28 (orbit 03661) to present

First release of data



Links to the Algorithm Theoretical Basis Document (ATBD), Product User Manual (PUM), and the Product Readme File (PRF) is provided here on the right under Documentation.