Comparison of emission ratios from on-road sources using a mobile laboratory under various driving and operational sampling modes

1 Molina Center for the Energy and the Environment, San Diego, California, USA 2 Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA 3 Center for Atmospheric and Environmental Chemistry; Center for Cloud and Aerosol Chemistry, Aerodyne Research Inc., Billerica, Massachusetts, USA 4 Department of Chemistry, Montana State University, Bozeman, Montana, USA 5 Departamento de Ingenieŕıa Quı́mica, Tecnológico de Monterrey, Monterrey, México 6 Center for Energy and Environmental Resources, University of Texas, Austin, Texas, USA 7 Dept. of Chemistry and Biochemistry, University of California, San Diego, California, USA