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Fourier transform infrared spectroscopy is an efficient technique for the detection and quantification of molecules in gas mixtures. Measurement 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, CO(2), NO, NO(2), N(2)O, NH(3), CH(4), SO(2), H(2)O, 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 rain influences.

Improvements in the quantitative evaluation of atmospheric Fourier‐transform infrared (FTIR) spectra, obtained in environmental monitoring by using a bistatic spectrometer setup, are presented. Preprocessing of interferograms and spectral data was carried out to improve the photometric accuracy and wave‐number scale reproducibility, necessary for reliable quantitative analysis. Univariate component analysis was optimized, and a refined strategy for multivariate analysis by least squares was set up. Special procedures were developed for the determination of benzene and of small molecules with resolved rotation–vibration fine structure. Results from field measurements, which were obtained by using the implemented subroutines for univariate and multivariate spectrum evaluation, are presented and discussed. © 1999 John Wiley & Sons, Inc. Field Analyt Chem Technol 3: 141–159, 1999

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