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We report the development and application of analytical techniques for atmospheric N 2 O based on Fourier transform infrared (FTIR) spectroscopy. Using mobile low resolution (1 cm -1 ) FTIR spectroscopy in the field, the technique delivers mixing ratio measurements of precision +/-0.3 ppbv (0.3 nmol mol -1 ) N 2 O and in situ soil-atmosphere flux chamber measurements...