Absorption cross sections of SO2 have been recorded at 295 K at the resolutions of 2 and 16 cm−1. The 27000‐ to 40000‐cm−1 spectral region has been investigated. The comparison with data available from the literature shows a good agreement between the different data sets (less than 5%). However, local discrepancies, for example at the peaks of absorption, can reach 20%.

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New laboratory measurement of NO 2 absorption cross-sections were performed using a Fourier transform spectrometer at 2 and 16 cm -1 ( 0.03 and 0.26 nm at 400 nm) in the visible range (380-830 nm) and at room temperature. The use of a Fourier transform spectrometer leads to a very accurate wavenumber scale (0.005 cm -1 , 8x10-5 nm at 400 nm). The uncertainty on the new measurements is better than 4%. Absolute and differential cross-sections are compared with published data, giving an agreement ranging from 2% to 5% for the absolute values. The discrepancies in the differential cross-section can however reach 18%. The influence of the cross-sections on the ground-based measurement of the stratospheric NO 2 total amount is also investigated.

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