title: On-road vehicle particulate matter and gaseous emission distributions in Las Vegas, Nevada, compared with other areas.
abstract: During the spring and summer of 2000, 2001, and 2002, gaseous and particulate matter (PM) fuel-based emission factors for approximately 150,000 low-tailpipe, individual vehicles in the Las Vegas, NV, area were measured via on-road remote sensing. For the gaseous pollutants (carbon monoxide, hydrocarbons, and nitrogen oxide), a commercial vehicle emissions remote sensing system (VERSS) was used. The PM emissions were determined using a Lidar-based VERSS. Emission distributions and their shapes were analyzed and compared with previous studies. The large skewness of the distributions is evident for both gaseous pollutants and PM and has important implications for emission reduction policies, because the majority of emissions are attributed to a small fraction of vehicles. Results of this Las Vegas study and studies at other geographical locations were compared. The gaseous pollutants were found to be close to those measured by VERSS in other U.S. cities. The PM emission factors for spark ignition and diesel vehicles are in the range of previous tunnel and dynamometer studies.
authors.affiliation: Division of Atmospheric Sciences, Desert Research Institute, Reno, Nevada 89512, USA. cmazz@dri.edu
authors.forename: Claudio
authors.initials: C
authors.lastname: Mazzoleni
authors.forename: Hampden D
authors.initials: HD
authors.lastname: Kuhns
authors.forename: Hans
authors.initials: H
authors.lastname: Moosmüller
authors.forename: Robert E
authors.initials: RE
authors.lastname: Keislar
authors.forename: Peter W
authors.initials: PW
authors.lastname: Barber
authors.forename: Norman F
authors.initials: NF
authors.lastname: Robinson
authors.forename: John G
authors.initials: JG
authors.lastname: Watson
authors.forename: Djordje
authors.initials: D
authors.lastname: Nikolic
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D000397:Air Pollution / Q000032:analysis*; D009505:Nevada; D001335:Vehicle Emissions / Q000032:analysis
chemical_list: D000393:Air Pollutants; D001335:Vehicle Emissions