Abstract. In this paper, we propose a system for monitoring abnormal NO 2 emissions in troposphere by using remote-sensing sensors. In particular, the system aims at estimating the amount of NO 2 resulting from biomass burning by exploiting the synergies between the GOME and the ATSR-2 sensors mounted on board of the ERS-2 satellite. Two different approaches to the estimation of NO 2 are proposed: the former, which is the simplest one, assumes a linear relationship between the GOME and ATSR-2 measurements and the NO 2 concentration. The latter exploits a nonlinear and nonparametric method based on a radial basis function (RBF) neural network. The architecture of such a network is defined in order to retrieve the values of NO 2 concentration on the basis of the GOME and ATSR-2 measurements, as well as of other ancillary input parameters.Experimental results, obtained on a real data set, confirm the effectiveness of the proposed system, which represents a promising tool for operational applications.

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