The modelled absorption coefficients of 14 N 16 O 2 are performed in the range of pure rotational and vibrational-rotational transitions at T = 300 K and T = 1000 K temperatures. The calculations were carried out on the basis of the developed by authors high-temperature database of NO 2 spectral line parameters and database HITRAN2012. The dipole moment function parameters of NO 2 up to the second order inclusive were also determined.