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 24 Aug 2018, where complex plume dynamics from intense fires in North America are captured with great detail. Saharan and dust belt plumes are also visible as well as biomass burning plumes from southern Africa. 

Data product version summary (click the highlighted version number for latest PRF).

Version number Version Effective Date Summary of Changes


NRTI: 2019-07-03 (orbit 08907 to present)
OFFL: 2019-06-26 (orbit 08815 to present)

Current version


NRTI: 2019-04-30 (orbit 08000 to 08906)
OFFL: 2019-04-23 (orbit 07907 to 08814)

No change


NRTI: 2019-03-27 (orbit 07519 to 07999)
OFFL: 2019-03-20 (orbit 07425 to 07906)

No change



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. Note: both the NRTI and the OFFL versions of this data product were publically released on 11 July 2018 and are available via the Copernicus Open Data Access Hub (see link on right).