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ON-ROAD REMOTE SENSING OF AUTOMOBILE EMISSIONS IN THE RESEARCH TRIANGLE PARK, NORTH CAROLINA AREA: 1997-2001
Citation:
Mann*, C O. AND J W. Jones*. ON-ROAD REMOTE SENSING OF AUTOMOBILE EMISSIONS IN THE RESEARCH TRIANGLE PARK, NORTH CAROLINA AREA: 1997-2001. U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-03/046, 2003.
Description:
The report describes automobile exhaust remote sensing data collected by EPA at a number of sites in the Research Triangle Park, NC area during 1997. Data were also collected at one site in Raleigh, NC from 1998 through 2001 for the Coordinating Research Council (CRC) study of real world vehicle exhaust emitter populations. Databases have been compiled that contain the valid remote sensing measurements for carbon dioxide (CO2), carbon monoxide (CO), hydrocarbons (HC), and multiple oxides of nitrogen (expressed as nitrogen oxide, NO). Vehicle identification information, speed, and acceleration were also recorded. For the Raleigh test site, an inverse relationship between model year and mean and median emissions values was observed, consistent with results from other remote sensing studies. The 1999 NO values were atypical and must be considered to be questionable. Over the five-year test period, mean NO emissions concentrations for specific model year vehicles tended to show an increase, consistent with the notion that emissions from vehicles increase with age due to deterioration effects. A slight tendency for deterioration of CO emissions from 1994 model year and newer vehicles was observed, but no meaningful trend could be identified for older vehicles. No conclusions could be reached about deterioration effects for HC.