The common passive or point by point scanning Fourier Transform Infrared Spectroscopy (FTIR)measurements with daylight sources are susceptible to stray light interference and are unable to obtain high spatial and temporal accuracy of gas concentration distribution.Therefore,array FTIR techniques are gaining importance in the remote measurement of pollutant gases.In this paper,a compact array FTIR device in the wavelength range of 7.4～12.5μmis used to conduct an experiment on pollutant emissions from a chemical park in the northern of China at night with the aid of moonlight scattering,and the measurement area including the chimney emission area and the chemical equipment emission area.After the raw interferometric data process and inverse Fourier transform,a full band irradiance grayscale map is obtained and a white emission gas cloud near the exit of chimney is observed with a higher irradiance than the background.Three black clouds in the emission area of the chemical equipment,the irradiance is lower than the background and there is an absorption effect.For the experimental measurements,the situ calibration is carried out using direct light from the moon as the standard light source.The maximum mean square error of the FTIR measurements is about 9%,with an uncertainty of 7% for the light source,an accuracy of 6% for the numerical processing method.According to the calculation model of the spatial concentration distribution of pollutants based on infrared hyperspectrum established in this paper,and compared with the ideal spectral lines in the HITRAN database,it is determined that the pollutants are mainly sulphides (SO2,H2S)with characteristic peaks of 1060cm -1,1310cm -1 and 1020cm -1,1210cm -1,respectively.The spatial and temporal distribution of the irradiance of the gas clouds is given in combination with the calibration data,with an imaging period of 1.5 s and a spatial resolution of about 0.4 m×0.4 m.According to the spatial and temporal clouds of pollutant emission concentrations obtained from the calculated inversion,it can be seen that the two chimneys are affected by the south easterly wind and the horizontal direction of 60° and 30°,to the northwest,respectively,and the gas concentrations drifted below the minimum detection limit of 19 ppm·m set in this paper at about 30 m from the emission outlet.The array FTIR measurement method developed in this paper,which is based on a moonlight scattering,achieves high spatial temporal resolution and high accuracy for the measurement of pollutant gases,which is of great significance for the quantitative measurement of chemical pollutant gases and greenhouse gas emissions.