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Validation summary

The Sentinel-5p TROPOMI L2_HCHO data product (tropospheric HCHO column; De Smedt et al., 2018) is in good overall agreement with correlative ground-based measurements (NDACC FTIR and NDACC MAX-DOAS) and with the OMI QA4ECV HCHO satellite data. The bias estimate is positive over clean areas, and negative over polluted areas, but meets the mission requirement (see Table below). In clean conditions, the dispersion estimate meets the mission requirement.


Product ID Stream Product Bias Dispersion Special features
HCHO, low +32% 9 Pmolec/cm2 Positive bias, low dispersion over clean areas (<2.5 Pmolec/cm2),
Negative bias, high dispersion over polluted areas (>8 Pmolec/cm2)
HCHO, high -30% 25 Pmolec/cm2


A detailed description of the method and a comprehensive discussion of validation results can be found in the Quarterly Validation Report #22: April 2018 - February 2024.


Latest Quarterly Validation Report Product info  Current Processor Version
 #22: April 2018 - February 2024  See



De Smedt, I. et al. Algorithm theoretical baseline for formaldehyde retrievals from S5P TROPOMI and from the QA4ECV project Atmos. Meas. Tech., 11, 2395-2426 (2018) doi:10.5194/amt-11-2395-2018