Fourier transform infrared spectroscopy is an efficient technique for
the detection and quantification of molecules in gas mixtures. Measure
ment results from a mobile laboratory for ambient air analysis and for
remote sensing of plume emission with the commercially available K300
spectrometer are reported. CO, CO2, NO, NO2, N2O, NH3, CH4, SO2, H2O,
HCl, and HCHO concentrations have been determined with good agreement
with in situ results. The on-line multicomponent analysis software is
based on line-by-line retrieval and least-squares fitting procedures,
including the effects of multiple aerosol scattering and cloud and ra
in influences.