Jose-Luis Jimenez
Distinguished Professor • Institute Fellow, CIRES
Chemistry • Cooperative Institute for Research in Environmental Sciences (CIRES)

Office: Cristol 436
Lab: Cristol 343 & 441
Lab Phone: 303-492-3631, 303-735-5990, 303-492-0820
Fax: 303-492-1149



Ph.D.: Massachusetts Institute of Technology, 1999
Postdoctoral Fellow: Aerodyne Research / M.I.T., 1999-2000
Postdoctoral Fellow: California Institute of Technology, 2000-02

Areas of Expertise

Aerosols, Atmospheric Chemistry, Aircraft Studies, Instrument Development, Mathematical Modeling, Disease Transmission

Awards and Honors

  • Ranked #9 among Top Scientists in Environmental Science for 2022 by
  • 2014 to 2022 Highly Cited Researcher (Thomson Reuters) in Geosciences
  • 2021 Named as a University of Colorado Distinguished Professor (Highest Honor for faculty at CU)
  • 5th Most Cited Scientist Worldwide in the Geosciences in 2014 over the last 10 years (List)
  • Citation Index h = 122
  • Top 10 cited scientist on aerosols
  • 2016 Elected as Fellow of the American Association for Aerosol Research (AAAR)
  • 2015 Elected as Fellow of the American Geophysical Union (AGU)
  • 2014 College Scholar Award, University of Colorado
  • 2012 AGU Ascent Award "as an exceptional mid-career scientist demonstrating excellence in research and leardership in his field"
  • 2010 Rosenstiel Award of the RSMAS School, University of Miami
  • 2008 Kenneth T. Whitby Award of the American Association for Aerosol Research (AAAR)
  • 2007 Provost Faculty Achievement Award, CU-Boulder
  • 2004 National Science Foundation Young Investigator "CAREER" Award
  • 2 "Fast Breaking Papers" and 8 "Hot Papers" (ISI Web of Science)
  • 84 "Highly Cited Papers" (ISI, Top 1% in their scientific areas)
  • 3 "Most Cited Papers" in Environmental Science and Technology
  • NASA Group Achievement Awards, 2003, 2006, 2008, 2015, 2018, and 2019
  • La Caixa Foundation Doctoral Fellowship, 1994-1996

Atmospheric Aerosols and Instrumentation

Our group's research centers on the development and application of advanced instrumentation for real-time, quantitative measurements of the size, chemical composition, and morphology of submicron aerosols. We care about atmospheric aerosols for many reasons, including their effect on radiation balance (climate forcing), severe short-term and long-term effects on human health, reduced visibility, and acid deposition ("acid rain"). Most of these effects are not well understood, in good part due to the limitations of the instrumentation available. Advanced instrumentation can be used to make much faster progress in many of these areas. We also investigate the role of aerosols in the transmission of respiratory diseases such as COVID-19.

Click here for complete list of publications

R.L.N. Yatavelli, H. Stark, S.L. Thompson, J.R. Kimmel, M.J. Cubison, D.A. Day, P. Campuzano-Jost, B.B. Palm, A. Hodzic, J.A. Thornton, J.T. Jayne, D.R. Worsnop, and J.L. Jimenez. Semi-Continuous Measurements of Gas-Particle Partitioning of Organic Acids in a Ponderosa Pine Forest Using a MOVI-HRToF-CIMS. Atmospheric Chemistry and Physics, 14, 1527-1546, doi:10.5194/acp-14-1527-2014, 2014. AbstractPDF, and Supp. Info.

A.M. Ortega, D.A. Day, M.J. Cubison, W.H. Brune, D. Bon, J. de Gouw, and J.L. Jimenez. Secondary organic aerosol formation and primary organic aerosol oxidation from biomass-burning smoke in a flow reactor during FLAME-3. Atmospheric Chemistry and Physics, 13, 11551-11571, doi:10.5194/acp-13-11551-2013, 2013. AbstractPDF, and Supp. Info.

P.L. Hayes, A.M. Ortega, M.J. Cubison, W.W. Hu, D.W. Toohey, J.H. Flynn, B.L. Lefer, N. Grossberg, S. Alvarez, B. Rappenglück, J.W. Taylor, J.D. Allan, J.S. Holloway, J.B. Gilman, W.C. Kuster, J.A. de Gouw, P. Massoli, X. Zhang, J. Liu, R.J. Weber, A.L. Corrigan, L.M. Russell, Y. Zhao, S.S. Cliff, G. Isaacman, D.R. Worton, N.M. Kreisberg, S.V. Hering, A.H. Goldstein, R. Thalman, E.M. Waxman, R. Volkamer, Y.H. Lin, J.D. Surratt, T.E. Kleindienst, J.H. Offenberg, K.D. Froyd, S. Dusanter, S. Griffith, P.S. Stevens, J. Brioude, W.M. Angevine, and J. L. Jimenez. Aerosol Composition and Sources in Los Angeles During the 2010 CalNex Campaign. Journal of Geophysical Research-Atmospheres, 118, 9233–9257, doi:10.1002/jgrd.50530, 2013. Paper, and PDF.

D.K. Farmer, Q. Chen, J.R. Kimmel, K.S. Docherty, E. Nemitz, P.A. Artaxo, C.D. Cappa, S.T. Martin, and J.L. Jimenez. Chemically-resolved particle fluxes over tropical and temperate forests. Aerosol Science and Technology, 47, 818-830, DOI:10.1080/02786826.2013.791022, 2013. Abstract and PDF.

I. Ulbrich, M.R. Canagaratna, N.L. Ng, Q. Zhang, and J.L. Jimenez. Three-dimensional factorization of size-resolved organic aerosol mass spectra from Mexico City. Atmospheric Measurement Techniques, 5, 195-224, doi:10.5194/amt-5-195-2012, 2012. AbstractPDF, and Supp. Info.

A. Hodzic and J.L. Jimenez. Modeling anthropogenically-controled secondary organic aerosols in a megacity: a simplified framework for global and climate models. Geoscientific Model Development, 4, 901-917, doi:10.5194/gmd-4-901-2011, 2011. AbstractPDF, and Supp. Info.

K.S. Docherty, A.C. Aiken, J.A. Huffman, I.M. Ulbrich, P.F. DeCarlo, D. Sueper, D.R. Worsnop, D.C. Snyder, B.D. Grover, D.J. Eatough, A.H. Goldstein, P.J. Ziemann, and J.L. Jimenez. The 2005 Study of Organic Aerosols at Riverside (SOAR-1): Overview, Instrumental Intercomparisons, and Fine Particle Composition. Atmospheric Chemistry and Physics Discussions, 11, 6301-6362, doi:10.5194/acpd-11-6301-2011, 2011. AbstractPDF, and Supp. Info.

D.V. Spracklen, J.L. Jimenez, K.S. Carslaw, D.R. Worsnop, M.J. Evans, G.W. Mann, Q. Zhang, M.R. Canagaratna, J. Allan, H. Coe, G. McFiggans, A. Rap and P. Forster. Aerosol mass spectrometer constraint on the global secondary organic aerosol budget. Atmospheric Chemistry and Physics Discussions, 11, 5699-5755, doi:10.5194/acpd-11-5699-2011, 2011. Abstract, and PDF.

D.K. Farmer, J.R. Kimmel, G. Phillips, K.S. Docherty, D.R. Worsnop, D. Sueper, E. Nemitz, and J.L. Jimenez. Eddy-Covariance Measurements with High-Resolution Time-of-Flight Aerosol Mass Spectrometry: A New Approach to Chemically-Resolved Aerosol Fluxes. Atmospheric Measurement Techniques Discussions, 3, 5867-5905, doi:10.5194/amtd-3-5867-2010, 2010. Abstract and PDF.

K. Dzepina, C.D. Cappa, R.M. Volkamer, S. Madronich, P.F. DeCarlo, R.A. Zaveri, and J.L. Jimenez. Modeling the Multiday Evolution and Aging of Secondary Organic Aerosol During MILAGRO 2006. Environmental Science and Technology, doi:10.1021/es103186, 2011. Abstract

C.B. Robinson, J.R. Kimmel, D.E. David, J.T. Jayne, A. Trimborn, D.R. Worsnop, and J.L. Jimenez. Thermal Desorption Metastable Atom Bombardment Aerosol Mass Spectrometry. International Journal of Mass Spectrometry, DOI: 10.1016/j.ijms.2011.01.027, 2011. Paper

 J.R. Kimmel, D.K. Farmer, M.J. Cubison, D. Sueper, C. Tanner, E. Nemitz, D.R. Worsnop, M. Gonin, and J.L. Jimenez. Real-time Aerosol Mass Spectrometry with Millisecond Resolution. International Journal of Mass Spectrometry,doi:10.1016/j.ijms.2010.12.004, 2011. PDF

J.H. Kroll, N.M. Donahue, J.L. Jimenez, S.H. Kessler, M.R. Canagaratna, K.R. Wilson, K.E. Altieri, L.R. Mazzoleni, A.S. Wozniak, H. Bluhm, E.R. Mysak, J.D. Smith, C.E. Kolb, and D.R. Worsnop. Carbon Oxidation State as a Metric for Describing the Chemistry of Atmospheric Organic Aerosol. Nature Chemistry, 3, 133-139, DOI:10.1038/NCHEM.948, 2011. PDF

U. Pöschl, S.T. Martin, B. Sinha, Q. Chen, S.S. Gunthe, J.A. Huffman, S. Borrmann, D.K. Farmer, R.M. Garland, G. Helas, J.L. Jimenez, S.M. King, A. Manzi, E. Mikhailov, T. Pauliquevis, M.D. Petters, A.J. Prenni, P. Roldin, D. Rose, J. Schneider, H. Su, S.R. Zorn, P. Artaxo, M.O. Andreae. Rainforest aerosols as biogenic nuclei of clouds and precipitation in the Amazon. Science, 329, 1513-1516, DOI: 10.1126/science.1191056, 2010.PDF

D.K. Farmer and J.L. Jimenez. Real-time atmospheric chemistry field instrumentation. Analytical Chemistry, 82, 7879–7884, doi:10.1021/ac1010603, 2010. PDF

D.K. Farmer, A. Matsunaga, K.S. Docherty, J.D. Surratt, J.H. Seinfeld, P.J. Ziemann, and J.L. Jimenez. Response of an Aerosol Mass Spectrometer to Organonitrates and Organosulfates and implications for Atmospheric Chemistry. Proceedings of the National Academy of Sciences of the USA, 107, 6670-6675, doi: 10.1073/pnas.0912340107, 2010. PDF

J.L. Jimenez, M.R. Canagaratna, N.M. Donahue, et al. Evolution of Organic Aerosols in the Atmosphere. Science, 2009. PDF

E.J. Dunlea, P.F. DeCarlo, A.C. Aiken, J.R. Kimmel, R.E. Peltier, R.J. Weber, J. Tomlison, D.R. Collins, Y. Shinozuka, C.S. McNaughton, S.G. Howell, A.D. Clarke, L.K. Emmons, E.C. Apel, G.G. Pfister, A. van Donkelaar, R.V. Martin, D.B. Millet, C.L. Heald, and J.L. Jimenez. Evolution of Asian Aerosols during Transpacific Transport in INTEX-B. Atmospheric Chemistry and Physics, 9, 7257-7287, 2009. AbstractPDF, and Supp. Info.

J.A. Huffman, K.S. Docherty, A.C. Aiken, M.J. Cubison, I.M. Ulbrich, P.F. DeCarlo, D. Sueper, J.T. Jayne, D.R. Worsnop, P.J. Ziemann and J.L. Jimenez. Chemically-Resolved Aerosol Volatility Measurements from Two Megacity Field Studies. Atmospheric Chemistry and Physics, 9, 7161-7182, 2009. AbstractPDF and Supp. Info.

J. de Gouw and J.L. Jimenez. Organic Aerosols in the Earth’s Atmosphere. Environmental Science and Technology, 43, 7614–7618, 2009. DOI: 10.1021/es9006004. PDF and doi

A.C. Aiken, D. Salcedo, M.J. Cubison, J.A. Huffman, P.F. DeCarlo, I.M. Ulbrich, K.S. Docherty, D. Sueper, J.R. Kimmel, D.R. Worsnop, A. Trimborn, M. Northway, E.A. Stone, J.J. Schauer, R. Volkamer, E. Fortner, B. de Foy, J. Wang, A. Laskin, V. Shutthanandan, J. Zheng, R. Zhang, J. Gaffney, N. Marley, G. Paredes-Miranda, W.P. Arnott, L.T. Molina, G. Sosa, and J.L. Jimenez. Mexico City Aerosol Analysis during MILAGRO using High Resolution Aerosol Mass Spectrometry at the Urban Supersite (T0). Part 1: Fine Particle Composition and Organic Source Apportionment. Atmospheric Chemistry and Physics, 9, 6633-6653, 2009. AbstractPDF and Supp. Info.

K. Dzepina, R.M. Volkamer, S. Madronich, P. Tulet, I.M. Ulbrich, Q. Zhang, C.D. Cappa, P.J. Ziemann, and J.L. Jimenez. Evaluation of Recently-Proposed Secondary Organic Aerosol Models for a Case Study in Mexico City. Atmospheric Chemistry and Physics, 9, 5681-5709, 2009. AbstractPDF, and Supp. Info.

M. Hallquist, J.C. Wenger, U. Baltensperger, Y. Rudich, D. Simpson, M. Claeys, J. Dommen, N.M. Donahue, C. George, A.H. Goldstein, J.F. Hamilton, H. Herrmann, T. Hoffmann, Y. Iinuma, M. Jang, M. Jenkin, J.L. Jimenez, A. Kiendler-Scharr, W. Maenhaut, G. McFiggans, T. Mentel, A. Monod, A.S.H. Prévôt, J.H. Seinfeld, J.D. Surratt, R. Szmigielski, J. Wildt. The Formation, Properties and Impact of Secondary Organic Aerosol: Current and Emerging Issues. Atmospheric Chemistry and Physics, 9, 5155-5235, 2009. Abstract and PDF.

J.A. Huffman, K.S. Docherty, C. Mohr, M.J. Cubison, I.M. Ulbrich, P.J. Ziemann, T.B. Onasch, and J.L. Jimenez. Chemically-Resolved Volatility Measurements of Organic Aerosol from Different Sources. Environmental Science and Technology, 43, 5351–5357, 2009. doi: 10.1021/es803539d. PDF

I.M. Ulbrich, M.R. Canagaratna, Q. Zhang, D.R. Worsnop, and J.L. Jimenez. Interpretation of Organic Components from Positive Matrix Factorization of Aerosol Mass Spectrometric Data. Atmospheric Chemistry and Physics , 9, 2891-2918, 2009. AbstractPDF, and Supp. Info.

C. Mohr, J.A. Huffman, M.J. Cubison, A.C. Aiken, K.S. Docherty, J.R. Kimmel, I.M. Ulbrich, M. Hannigan, J. Garcia, and J.L. Jimenez. Characterization of Primary Organic Aerosol Emissions from Meat Cooking, Trash Burning, and Motor Vehicles with High-Resolution Aerosol Mass Spectrometry and Comparison with Ambient and Chamber Observations. Environmental Science and Technology, 43, 2443-2449, doi:10.1021/es8011518, 2009. PDF

M.J. Cubison, B. Ervens, G. Feingold, K. Docherty, I. Ulbrich, L. Shields, K. Prather, S. Hering and J.L. Jimenez. The Influence of Chemical Composition and Mixing State of Los Angeles Urban Aerosol on CCN number and Cloud Properties. Atmospheric Chemistry and Physics, 8, 5649-5667, 2008. Abstract and PDF

K.S. Docherty, E.A. Stone, I.M. Ulbrich, P.F. DeCarlo, D.C. Snyder, J.J. Schauer, R.E. Peltier, R.J. Weber, S.M. Murphy, J.H. Seinfeld, B.D. Grover, D.J. Eatough, and J.L. Jimenez. Apportionment of Primary and Secondary Organic Aerosols in Southern California during the 2005 Study of Organic Aerosols in Riverside (SOAR). Environmental Science and Technology, 42, 7655?7662, doi: 10.1021/es8008166, 2008. PDF and Supp. Info.

P.F. DeCarlo, E.J. Dunlea, J.R. Kimmel, A.C. Aiken, D. Sueper, J. Crounse, P.O. Wennberg, L. Emmons, Y. Shinozuka, A. Clarke, J. Zhou, J. Tomlinson, D. Collins, D. Knapp, A. Weinheimer, D. D. Montzka, T. Campos, and J.L. Jimenez. Fast airborne aerosol size and chemistry measurements above Mexico City and Central Mexico during the MILAGRO campaign. Atmospheric Chemistry and Physics, 8, 4027-4048, 2008. AbstractPDF and Supp. Info.

A.C. Aiken, P.F. DeCarlo, and J.L. Jimenez. Elemental Analysis of Organic Species with Electron Ionization High-Resolution Mass Spectrometry. Analytical Chemistry, 79, 8350-8358, doi:10.1021/ac071150w, 2007. PDF

Q. Zhang, J.L. Jimenez et al. Ubiquity and Dominance of Oxygenated Species in Organic Aerosols in Anthropogenically?Influenced Northern Hemisphere Mid-latitudes. Geophysical Research Letters, 34, L13801, doi:10.1029/2007GL029979, 2007. PDF

K. Dzepina, J. Arey, L.C. Marr, D.R. Worsnop, D. Salcedo, Q. Zhang, T.B. Onasch, L.T. Molina, M.J. Molina, and J.L. Jimenez. Detection of Particle-Phase Polycyclic Aromatic Hydrocarbons in Mexico City using an Aerosol Mass Spectrometer. International Journal of Mass Spectrometry, 263(2-3), 152-170, 2007. PDF

Canagaratna, M.R., Jayne, J.T., Jimenez, J.L., Allan, J.D., Alfarra, M.R, Zhang, Q., Onasch, T.B., Drewnick, F., Coe, H., Middlebrook, A., Delia, A., Williams, L.R., Trimborn, A.M., Northway, M.J., DeCarlo, P.F., Kolb, C.E., Davidovits, P., Worsnop, D.R. Chemical and Microphysical Characterization of Ambient Aerosols with the Aerodyne Aerosol Mass Spectrometer. Mass Spectrometry Reviews, 26, 185? 222, 2007. PDF

P.F. DeCarlo, J.R. Kimmel, A. Trimborn, M.J. Northway, J.T. Jayne, A.C. Aiken, M. Gonin, K. Fuhrer, T. Horvath, K. Docherty, D.R. Worsnop, and J.L. Jimenez. Field-Deployable, High-Resolution, Time-of-Flight Aerosol Mass Spectrometer. Analytical Chemistry, 78: 8281-8289, 2006. PDF

R. Volkamer, J.L. Jimenez, F. San Martini, K. Dzepina, Q. Zhang, D. Salcedo, L.T. Molina, D.R. Worsnop, and M.J. Molina. Secondary Organic Aerosol Formation from Anthropogenic Air Pollution: Rapid and Higher than Expected. Geophysical Research Letters, 33(17), L17811, 2006. PDF

D. Salcedo et al. Characterization of ambient aerosols in Mexico City during the MCMA-2003 campaign with Aerosol Mass Spectrometry: results from the CENICA Supersite. Atmospheric Chemistry and Physics, 6, 925-946, 2006. PDF

Q. Zhang, D.R. Worsnop, M.R. Canagaratna, and J.L. Jimenez. Hydrocarbon-like and Oxygenated Organic Aerosols in Pittsburgh: Insights into Sources and Processes of Organic Aerosols. Atmospheric Chemistry and Physics, 5, 3289-3311, 2005. PDF

J.A. Huffman, J.T. Jayne, F. Drewnick, A.C. Aiken, T. Onasch, D.R. Worsnop, and J.L. Jimenez. Design, Modeling, Optimization, and Experimental Tests of a Particle Beam Width Probe for the Aerodyne Aerosol Mass Spectrometer. Aerosol Science and Technology, 39(12): 1143-1163, 2005, doi: 10.1080/02786820500423782. PDF

Q. Zhang, M.R. Alfarra, D.R. Worsnop, J.D. Allan, H.Coe, M.R. Canagaratna, and J.L. Jimenez. Deconvolution and quantification of hydrocarbon-like and oxygenated organic aerosols based on aerosol mass spectrometry. Environmental Science and Technology, 39: 4938-4952, 2005, doi:10.1021/es048568l. PDF

Q. Zhang, M.R. Canagaratna, J.T. Jayne, D.R. Worsnop, and J.L. Jimenez. Time and Size-Resolved Chemical Composition of Submicron Particles in Pittsburgh ? Implications for Aerosol Sources and Processes. Journal of Geophysical Research - Atmospheres 110, D07S09, doi:10.1029/2004JD004649, 2005. PDF

DeCarlo, P., Slowik, J.G., Worsnop, D.R., Davidovits, P., and Jimenez, J.L. Particle Morphology and Density Characterization by Combined Mobility and Aerodynamic Diameter Measurements. Part 1: Theory. Aerosol Science and Technology, 38: 1185-1205, 2004. DOI: 10.1080/027868290903907. PDF

M. Dunn, J.L. Jimenez, D. Baumgardner, T. Castro, P.H. McMurry, J.N. Smith. Measurements of Mexico City nanoparticle size distributions: Observations of new particle formation and growth. Geophysical Research Letters, Vol. 31, L10102, doi:10.1029/2004GL019483, 2004. PDF

Q. Zhang, C.O. Stanier, M.C. Canagaratna, J.T. Jayne, D.R. Worsnop, S.N. Pandis, and J.L. Jimenez. Insights into the Chemistry of Nucleation Bursts and New Particle Growth Events in Pittsburgh Based on Aerosol Mass Spectrometry. Environmental Science and Technology, 38: 4797-4809, 2004. PDF

Jimenez, J.L., Cocker, D.R., Bahreini, R., Zhuang, H., Varutbangkul, V., Flagan, R.C., Seinfeld, J.H., Hoffmann, T., and O'Dowd, C. New Particle Formation from Photooxidation of Diiodomethane (CH2I2). Journal of Geophysical Research - Atmospheres, Vol. 108, No. D10, 4318, doi:10.1029/2002JD002452, 2003. PDF

Bahreini, R., J.L. Jimenez, J. Wang, J.T. Jayne, D.R. Worsnop, R.C. Flagan, and J.H. Seinfeld, Aircraft-based Aerosol Size and Composition Measurements during ACE-Asia using an Aerodyne Aerosol Mass Spectrometer, Journal of Geophysical Research - Atmospheres, Vol. 108, No. D23, 8645, doi:10.1029/2002JD003226, 2003. PDF

Jimenez, J.L., Jayne, J.T., Shi, Q., Kolb, C.E., Worsnop, D.R., Yourshaw, I., Seinfeld, J.H., Flagan, R.C., Zhang, X., Smith, K.A., Morris, J., and Davidovits, P. Ambient Aerosol Sampling with an Aerosol Mass Spectrometer. Journal of Geophysical Research - Atmospheres, 108(D7), 8425, doi:10.1029/2001JD001213, 2003. PDF

O'Dowd, Jimenez, J.L., Bahreini, R., Flagan, R.C., Seinfeld, J.H., Kulmala, M., Pirjola, L., and Hoffmann, T. Particle Formation in the Marine Atmosphere Controlled by Biogenic Iodine Emissions. Nature 417:632-636 (2002). PDF and News& Views