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Present and future satellite observations offer great potential formonitoring air quality on a daily and global basis. However, measurements fromcurrently orbiting satellites do not allow a single sensor to accurately probesurface concentrations of gaseous pollutants such as troposphericozone. Combining information from IASI (Infrared Atmospheric SoundingInterferometer) and GOME-2 (Global Ozone Monitoring Experiment-2)respectively in the TIR and UV spectra, a recent multispectral method(referred to as IASI+GOME-2) has shown enhanced sensitivity for probingozone in the lowermost troposphere (LMT, below 3 km altitude) withmaximum sensitivity down to 2.20 km a.s.l. over land, while sensitivity forIASI or GOME-2 alone only peaks at 3 to 4 km at the lowest.  In this work we develop a pseudo-observation simulator and evaluate thepotential of future EPS-SG (EUMETSAT Polar System – Second Generation)satellite observations, from new-generation sensors IASI-NG (InfraredAtmospheric Sounding Interferometer – New Generation) and UVNS (UltravioletVisible Near-infrared Shortwave-infrared), to observe near-surface O<sub>3</sub>through the IASI-NG+UVNS multispectral method. The pseudo-real state ofthe atmosphere is provided by the MOCAGE (MOdèle de Chimie Atmosphériqueà Grande Échelle) chemical transport model. We perform full andaccurate forward and inverse radiative transfer calculations for a period of4 days (8–11 July 2010) over Europe.  In the LMT, there is a remarkable agreement in the geographical distributionof O<sub>3</sub> partial columns between IASI-NG+UVNS pseudo-observations and the correspondingMOCAGE pseudo-reality. With respect to synthetic IASI+GOME-2 products,IASI-NG+UVNS shows a higher correlation between pseudo-observations andpseudo-reality, which is enhanced by about 12 %. The bias on high ozone retrievalis reduced and the average accuracy increases by 22 %. The sensitivity toLMT ozone is also enhanced. On average, the degree of freedom forsignal is higher by 159 % over land (from 0.29 to 0.75)and 214 % over ocean (from 0.21 to 0.66). The mean height of maximum sensitivity for the LMT peaks at 1.43 kmover land and 2.02 km over ocean, respectively 1.03 and 1.30 km belowthat of IASI+GOME-2. IASI-NG+UVNS also shows good retrieval skill in thesurface–2 km altitude range. It is one of a kind for retrieving ozone layers of 2–3 km thickness, in thefirst 2–3 km of the atmosphere. IASI-NG+UVNS is expected to largelyenhance the capacity to observe ozone pollution from space

Potential of multispectral synergism for observing ozone pollution by combining IASI-NG and UVNS measurements from the EPS-SG satellite