Data products

Nitrogen Dioxide

Notification to all S5P/TROPOMI NO2 data users: 

The upgrade to version 2.2.0 (5 July 2021) leads to an increase of the tropospheric NO2 columns for cloud-free pixels and the previous upgrade to version 1.4.0 (2 December 2020) led to a substantial increase in the observed tropospheric NO2 column amounts over polluted areas for scenes with small cloud fractions. For time series, trend studies or comparisons between years the results versions should not be mixed without accounting for these changes, as the series would show artificial (positive) jumps. For a more detailed description please refer to the NO2 Product Readme File (PRF) and check out this link for an overview and access to sample data. Now, at the user request a reprocessed dataset for NO2 is available, including a Readme File describing this reprocessed dataset.



Nitrogen dioxide (NO2) and nitrogen oxide (NO) together are usually referred to as nitrogen oxides (NOx = NO + NO2). They are important trace gases in the Earth’s atmosphere, present in both the troposphere and the stratosphere. They enter the atmosphere as a result of anthropogenic activities (notably fossil fuel combustion and biomass burning) and natural processes (such as microbiological processes in soils, wildfires and lightning). During daytime, i.e. in the presence of sunlight, a photochemical cycle involving ozone (O3) converts NO into NO2 (and vice versa) on a timescale of minutes, so that NO2 is a robust measure for concentrations of nitrogen oxides. The TROPOMI NO2 (see figure) processing system is based on the algorithm developments for the DOMINO-2 product and for the EU QA4ECV NO2 reprocessed dataset for OMI, and has been adapted for TROPOMI. This retrieval-assimilation-modelling system uses the 3-dimensional global TM5-MP chemistry transport model at a resolution of 1x1 degree as an essential element (see ATBD for details). 

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

Version number Version Effective Date Summary of Changes


OFFL: orbit 24655, 2022-07-17
NRTI:  orbit 24697, 2022-07-20

Current version; new L1b; DLER


OFFL: orbit 21188, 2021-11-14
NRTI:  orbit 21223, 2021-11-17

Current version


OFFL: orbit 19258, 2021-07-01
NRTI:  orbit 19308, 2021-07-05

updated L1b, Extensive changes

see PRF 



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). A supporting PUM for the NO2 a priori profile data is also available here. The interested user can download a tool developed in Python for working with the TROPOMI a priori profiles used for NO2, SO2, and HCHO (see download link here below).