Using open-path Fourier transform infrared spectroscopy (OP-FTIR) we have measured the variations in ambient concentrations of carbon monoxide (CO), carbon dioxide (CO 2 ), and nitrous oxide (N 2 O) caused by emissions from motor vehicles at a high traffic site in the Denver metropolitan area. Comparison of the OP-FTIR data to average emissions results obtained from on-road exhaust analysis using individual vehicle remote sensing revealed reasonable agreement, with a CO emission ratio (CO/CO 2 ) of 0.050 ± 0.004 (100 ± 8 g CO/kg fuel) from OP-FTIR and 0.059 (118 g CO/kg fuel) from the on-road measurements. We also report a N 2 O emission ratio of (1.87 ± 0.13) × 10 - 4 (0.59 ± 0.04 g N 2 O/kg fuel) from OP-FTIR and outline the potential of OP-FTIR for on-road measurements of several important exhaust components.
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Bradley et al. (2000) studied this question.
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