Data products

Aerosol Layer Height


The TROPOMI Aerosol Layer Height (ALH) product focuses on retrieval of vertically localized aerosol layers in the free troposphere, such as desert dust, biomass burning aerosol, or volcanic ash plumes in layers for cloud-free scenes. Applications include radiative forcing studies, long-range transport modeling and studies of cloud formation processes, and are of use for aviation safety. Retrieval of aerosol height is based on absorption in the O2 A band in the near-infrared wavelength range (759 and 770 nm). Currently the ALH algorithm is undergoing rigorous optimization and testing aimed at improving the speed of the retrieval. Results from the scientific, non-operational, TROPOMI ALH processor yield very promising results as shown in the figure below, for the California fires on 12 Dec 2017, with retrieved aerosol optical depth (left) and retrieved layer height in pressure units (right).

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


NRTI: 2019-09-30 (orbit 10171 to present)
OFFL: 2019-06-26 (orbit 08815 to present)

Current version


RPRO: 2019-04-30 (orbit 02818 to 07424)
OFFL: 2019-04-23 (orbit 07907 to 08814)

No changes


OFFL: 2019-03-20 (orbit 07425 to 07906)

Initial version



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 30 September 2019 and are available via the Copernicus Open Data Access Hub (see link on right).