Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 6 12 2006 10.5194/acp-6-5339-2006 http://www.atmos-chem-phys.net/6/5339/2006/ http://www.atmos-chem-phys.net/6/5339/2006/acp-6-5339-2006.html http://www.atmos-chem-phys.net/6/5339/2006/acp-6-5339-2006.pdf 5339 5346 2006-11-27 Tecnical Note: Analysis of non-regulated vehicular emissions by extractive FTIR spectrometry: tests on a hybrid car in Mexico City F. Reyes grutter@servidor.unam.mx M. Grutter A. Jazcilevich R. González-Oropeza Centro de Ciencias de la Atmósfera, Universidad Nacional Autónoma de México, 04510 México D.F., Mexico Facultad de Ingeniería, Universidad Nacional Autónoma de México, 04510 México D.F., Mexico A methodology to acquire valuable information on the chemical composition and evolution of vehicular emissions is presented. The analysis of the gases is performed by passing a constant flow of a sample gas from the tail-pipe into a 10 L multi-pass cell. The absorption spectra within the cell are obtained using an FTIR spectrometer at 0.5 cm^−1 resolution along a 13.1 m optical path. Additionally, the total flow from the exhaust is continuously measured from a differential pressure sensor on a \textit{Pitot} tube installed at the exit of the exhaust. This configuration aims to obtain a good speciation capability by coadding spectra during 30 s and reporting the emission (in g/km) of both criteria and non-regulated pollutants, such as CO₂, CO, NO, SO₂, NH₃, HCHO and some NMHC, during predetermined driving cycles. The advantages and disadvantages of increasing the measurement frequency, as well as the effect of other parameters such as spectral resolution, cell volume and flow rate, are discussed. To test and evaluate the proposed technique, experiments were performed on a dynamometer running FTP-75 and typical driving cycles for the Mexico City Metropolitan Area (MCMA) on a Toyota Prius hybrid vehicle. 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