Methods for correcting errors in solar absorption FTIR spectroscopy using the Sun as the light source were developed. A novel camera-based solar tracker is presented, providing robust tracking accuracies better than 30 arc sec. A method for correcting mis-sampling artifacts in the interferograms is shown. A portable and robust low-resolution FTIR spectrometer was developed for measuring total column CO2 values. An agreement of 0.1% was reached compared to a co-located TCCON reference instrument.