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Hydrogen peroxide H2O2 has been suggested as a possible oxidizer of the Martian surface. However, this minor species has never been detected. Photochemical models suggest that H2O2 and H2O abundances should be correlated. We have searched for H2O2 in the northern atmosphere of Mars, on Feb. 2-3, 2001 (Ls= 112 deg), at a time corresponding to maximum water vapor abundance in the northern hemisphere. The TEXES high-resolution grating spectrograph was used at the NASA/Infrared Telescope Facility (IRTF). Individual lines of the H2O26 band were searched for in the 1226-1235 cm 1

A stringent upper limit of the $\mathsf{H_2O_2}$ abundance in the Martian atmosphere