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A new technology is proposed in which a molecular field effect transistor is used to titrate quantitatively ozone in air in the range 0-300ppb. Good results have been obtained by employing a procedure of measurement in which the equilibrium state is never reached. Both the stability of the device and the reproducibility have been tested and shown to be satisfactory. X-ray photoelectron spectroscopy (XPS) and UV-VIS absorption measurements have demonstrated that only the superficial layer of the molecular layer (PcNi) is degraded by ozone leading to a long sensor lifetime.