Chris Ruehl, Staff Air Pollution Specialist, California Air Resources Board

Publications (email me for reprints):

Ruehl, C; Misra, C; Yoon, S; Smith, J; Burnitzki, M; Hu, S; Collins, J; Tan, Y; Huai, T; Herner, J: Evaluation of Heavy-Duty Vehicle Emission Controls with a Decade of California Real-World Observations, JAWMA (2021).

Tan, Y; Yoon, S; Ruehl, CR; Herner, J; Henderick, P; Montes, T; Latt, J; Lee, A; Florea, E; Lemieux, S; Robertson, W; Hu, S; Huai, T: Assessment of In-Use NOx Emissions from Heavy-Duty Diesel Vehicles Equipped with Selective Catalytic Reduction Systems, Environ. Sci. Technol. (2021).

Zhan, T; Ruehl, C; Bishop, G; Hosseini, S; Collins, J; Yoon, S; Herner, J: An analysis of real-world exhaust emission control deterioration in the California light-duty gasoline vehicle fleet, Atmos. Environ. (2019).

Smith, JD; Ruehl, C; Burnitzki, M; Sobieralski, W; Ianni, R; Quiros, D; Hua, S; Chernich, D; Collins, J; Huai, T; Dwyer, H: Real-time particulate emissions rates from active and passive heavy-duty diesel particulate filter regeneration, Sci. Total Environ. (2019).

Collier, S; Ruehl, C; Yoon, S; Boriboonsomsin, K; Durbin,TD; Scora, G; Johnson, K; Herner, J: Impact of Heavy-Duty Diesel Truck Activity on Fuel Consumption and Its Implication for the Reduction of Greenhouse Gas Emissions, Transport. Res. Rec. (2019).

Yang, J; Roth, P; Ruehl, CR; Shafer, MM; Antkiewicz, DS; Durbin, TD; Cocker, D; Asa-Awuku, A; Karavalakis, G: Physical, chemical, and toxicological characteristics of particulate emissions from current technology gasoline direct injection vehicles, Sci. Total Environ. (2019).

Ruehl, C; Smith JD; Ma Y; Shields J; Burnitzki M; Sobieralski W; Ianni R; Chernich, D; Chang M-C; Collins, J; Yoon S; Quiros D; Hu S; & Dwyer H: Emissions During and Real-world Frequency of Heavy-duty Diesel Particulate Filter Regeneration, Environ. Sci. Technol. (2018).

Forestieri, SD; Staudt, SM; Kuborn, TM; Faber, K; Ruehl, CR; Bertram, TH; & Cappa, CD: Establishing the impact of model surfactants on cloud condensation nuclei activity of sea spray aerosol mimics, Atmos. Chem. Phys. (2018).

Ho, P; Quiros, D; Robertson, W; Ruehl, C; Sobieralski, W; Ianni, R; Chernich, D; Littaua, R: Evaluation of Greenhouse Gas Emission Benefits of Vehicle Speed Limiters on On-Road Heavy-Duty Line-Haul Vehicles, Emiss. Cntrl. Sci. Technol. (2018).

Misra, C; Ruehl, C; Collins, J; Chernich, D; & Herner, J: In-use NOx emissions from diesel and liquefied natural gas refuse trucks equipped with SCR and TWC respectively, Environ. Sci. Technol. (2017).

Ruehl, C; Davies, J; Wilson, K: An interfacial mechanism for cloud droplet formation on organic aerosols, Science (2016).

Chan, AWH; Kreisberg, N; Hohaus, T; Campuzano-Jost, P.; Zhao, Y; Day, D; Kaser, L; Karl, T; Hansel, A; Teng, A; Ruehl, C; Sueper, D; Jayne, J; Worsnop, D; Jimenez, J; Hering, S; Goldstein, A: Speciated measurements of semivolatile and intermediate volatility organic compounds (S/IVOCs) in a pine forest during BEACHON-RoMBAS 2011, Atmos. Chem. Phys. (2016).

Ruehl, C; Herner, J; Yoon, S; Collins, J; Misra, C; Na, K; Robertson, W; Biswas, S; Chang, MC; Ayala, A: Similarities and Differences Between "Traditional" "and Clean" Diesel PM, Emiss. Cntrl. Sci. Technol. (2015).

Nah, T; Zhang, H; Worton, D; Ruehl, C; Kirk, B; Goldstein, A; Leone, S; Wilson, K: Isomeric Product Detection in the Heterogeneous Reaction of Hydroxyl Radicals with Aerosol Composed of Branched and Linear Unsaturated Organic Molecules, J. Phys. Chem. A, (2014).

Ruehl, C; Wilson, K: Surface Organic Monolayers Control the Hygroscopic Growth of Submicron Particles at High Relative Humidity, J. Phys. Chem. A, (2014).

Worton, DR; Isaacman, G; Gentner, DR; Dallmann, TR; Chan, AWH; Ruehl, C; Kirchstetter, TW; Wilson, K; Harley, RA; Goldstein, AH: Lubricating Oil Dominates Primary Organic Aerosol Emissions from Motor Vehicles, Environ. Sci. Tech., (2014).

Ruehl, C; Nah, T; Isaacman, G; Worton, D; Chan, A; Kolesar, K; Cappa, C; Goldstein, A; Wilson, K: The influence of molecular structure and aerosol phase on the heterogeneous oxidation of normal and branched alkanes by OH, J. Phys. Chem. A, (2013).

Zhang, H; Ruehl, C; Chan, A; Nah, T; Worton, D; Isaacman, G; Goldstein, A; Wilson, K: OH-Initiated Heterogeneous Oxidation of Cholestane: A Model System for Understanding the Photochemical Aging of Cyclic Alkane Aerosols, J. Phys. Chem. A (2013).

Raatikainen, T; Nenes, A; Seinfeld, JH; Morales, R; Moore, RH; Lathem, TL; Lance, S; Padro, LT; Lin, JJ; Cerully, KM; Bougiatioti, A; Cozic, J; Ruehl, CR; Chuang, PY; Anderson, BE; Flagan, RC; Jonsson, H; Mihalopoulos, N; Smith, JN: Worldwide data sets constrain the water vapor uptake coefficient in cloud formation, Proc. Natl. Acad. Sci. USA, 110, 3760-3764 (2013).

Harmon, CW; Ruehl, CR; Cappa, CD; Wilson, KR: A Statistical Description of the Evolution of Cloud Condensation Nuclei Activity during the HeterogeneousOxidation of Squalane and Bis(2-ethylhexyl) Sebacate Aerosol by Hydroxyl Radicals., Phys. Chem. Chem. Phys., 15, 9679-9693 (2013).

Chan, A; Isaacman, G; Wilson, K; Worton, D; Ruehl, C; Nah, T; Gentner, D; Dallmann, T; Kirchstetter, T; Harley, R; Gilman, J; Kuster, B; de Gouw, J; Offenberg, J; Kleindienst, T; Lin, Y; Rubitschun, C; Surratt, J; Hayes, P; Jimenez, J; Goldstein, A: Detailed chemical characterization of unresolved complex mixtures in atmospheric organics: Insights into emission sources, atmospheric processing and Secondary Organic Aerosol formation, J. Geophys. Res., 118 (12), 6783-6796 (2013).

Ruehl, CR; Chuang, PY; Nenes, A; Cappa, CD; Kolesar, KR; Goldstein, AH: Strong evidence of surface tension reduction in microscopic aqueous droplets, Geophys. Res. Lett., 39, L23801 (2012).

Isaacman, G; Chan, AWH; Nah, T; Worton, DR; Ruehl, CR; Wilson, KR; Goldstein, AH: Heterogeneous OH Oxidation of Motor Oil Particles Causes Selective Depletion of Branched and Less Cyclic Hydrocarbons, Environ. Sci. & Technol., 46, 10632-10640 (2012).

Ge, X; Zhang, Q; Sun, Y; Ruehl, C; Setyan, A: Effect of aqueous-phase processing on aerosol chemistry and size distributions in Fresno, California, during wintertime, Environ. Chemistry, 9, 221-235 (2012).

Ruehl, CR; Ham, WA; Kleeman, MJ: Temperature-induced volatility of molecular markers in ambient airborne particulate matter, Atmos. Chem. Phys., 11, 67-76 (2011).

Ham, WA; Ruehl, CR; Kleeman, MJ: Seasonal Variation of Airborne Particle Deposition Efficiency in the Human Respiratory System, Aerosol Sci. Tech., 45, 795-804 (2011).

Hatch, CE; Fisher, AT; Ruehl, CR; Stemler, G: Spatial and temporal variations in streambed hydraulic conductivity quantified with time-series thermal methods, J. Hydrol., 389, 276-288 (2010).

Ruehl, CR; Chuang, PY; Nenes, A: Aerosol hygroscopicity at high (99 to 100%) realtive humidities, Atmos. Chem. Phys., 10, 1329-1344 (2010).

Ruehl, CR; Chuang, PY; Nenes, A: Distinct CCN activation kinetics above the marine boundary layer along the California coast, Geophys. Res. Lett., 36, L15814 (2009).

Ruehl, CR; Chuang, PY; Nenes, A: How quickly do cloud droplets form on atmospheric particles? Atmospheric Chemistry and Physics, 8, 1043-1055 (2008).

Ruehl, C., A.T. Fisher, M. Los Huertos, S.D. Wankel, C.G. Wheat, CG; Kendall, C; Hatch, CE; Shennan, C: Nitrate dynamics within the Pajaro River, a nutrient-rich, losing stream. Journal of the North American Benthological Society, 26(2):191-206 (2007).

Ruehl, C., A.T. Fisher, C. Hatch, M. Los Huertos, G. Stemler, and C. Shennan, 2006, Differential gauging and tracer tests resolve seepage fluxes in a strongly-losing stream. Journal of Hydrology, 330:235-248 (2006).

Hatch, C.E., A.T. Fisher, J.S. Revenaugh, J. Constantz, and C. Ruehl, Quantifying surface water-groundwater interactions using time series analysis of streambed thermal records: Method development, Water Resources Research, 42(10): Art. No. W10410 (2006).