Dr. Imad El Haddad

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Research Laboratory Head a.i.
Group Head Molecular Cluster and Particle Processes

Paul Scherrer Institute
Forschungsstrasse 111
5232 Villigen PSI
Switzerland






My vision is to understand and quantify the processes by which anthropogenic emissions have changed the composition and levels of atmospheric pollutants and how these changes affect earth climate and public health. To gain insights into the mechanisms behind these processes and identify pollution sources, we develop and use new online and offline mass spectrometers, which analyze the atmospheric composition on a molecular level and down to 1 Hz time resolution. We deploy these instruments in the laboratory during simulation experiments and in the Field. We collaborate with global modelers and biochemist to quantify the overall impact of air pollution on climate and health.

2018- present Group head, Molecular Cluster and Particle Processes group at the Laboratory of Atmospheric Chemistry (LAC), Paul Scherrer Institut (PSI), Switzerland
2018-2019 Tenured scientist, project leader, deputy head, Molecular Cluster and Particle Processes group at the LAC, PSI, Switzerland
2015-2018 Senior scientist, Smog chamber group at the LAC, PSI, Switzerland
2011-2015 Postdoctoral fellow at the LAC, PSI, Switzerland
2007 – 2011 Ph.D. student in atmospheric chemistry, at "Laboratoire Chimie Provence", Atmospheric Reactivity and Instrumentation group, University of Provence, Marseille, France. Title: Primary and secondary fractions of organic aerosol; Source contribution and atmospheric aging in an urban Mediterranean environment, Marseille, France
2006 – 2007 Second year masters in environmental sciences: analytical chemistry, reactivity and modeling, University of Provence, Marseille, France (with distinction, 1/9).
2005 – 2006 First year masters in general chemistry at the faculty of sciences, in Saint-Joseph University of Beirut (USJ), Lebanon (with distinction, 1/10).
2002 – 2005 Bachelor of science in chemistry at the faculty of sciences, in USJ, Lebanon (with distinction, 1/14).
Identification and quantification of primary and secondary molecular markers in atmospheric aerosol using mass spectrometry techniques (GC/MS, HPLC/APCI-MS2 , HPLC/ESI-MS2).
Source apportionment of organic aerosol in ambient atmospheres using molecular markers, 14C measurements and AMS data combined with statistical models (e.g. Chemical Mass Balance, CMB).
Chemical characterization of main emission sources of hydrocarbons and organic aerosol (e.g. cooking processes, combustion engines, wood burning ...), determination of the related emission factors and quantification of their secondary organic aerosol potential by means of smog chamber experiments.
Characterization of gas phase and in-cloud aqueous phase aging processes and their impact on the molecular marker profiles, on the formation of high molecular weight compounds (i.e. oligomers) and on the organic aerosol functional groups and oxidation state
2007 – 2010 MENRT research fellowship from the French ministry of research
2005 Excellence Scholarship from the University of Saint Joseph as the top 1% students of the faculty of sciences
2005 “Distinction Prize” from the University of Saint Joseph as the best student in the class of 2005.



  • Canonaco F, Tobler A, Chen G, Sosedova Y, Slowik JG, Bozzetti C, et al.
    A new method for long-term source apportionment with time-dependent factor profiles and uncertainty assessment using SoFi Pro: application to 1 year of organic aerosol data
    Atmospheric Measurement Techniques. 2021; 14(2): 923-943. https://doi.org/10.5194/amt-14-923-2021
    DORA PSI
  • Cassagnes LE, Leni Z, Håland A, Bell DM, Zhu L, Bertrand A, et al.
    Online monitoring of volatile organic compounds emitted from human bronchial epithelial cells as markers for oxidative stress
    Journal of Breath Research. 2021; 15(1): 016015 (11 pp.). https://doi.org/10.1088/1752-7163/abc055
    DORA PSI
  • Chen G, Sosedova Y, Canonaco F, Fröhlich R, Tobler A, Vlachou A, et al.
    Time-dependent source apportionment of submicron organic aerosol for a rural site in an alpine valley using a rolling positive matrix factorisation (PMF) window
    Atmospheric Chemistry and Physics. 2021; 21(19): 15081-15101. https://doi.org/10.5194/acp-21-15081-2021
    DORA PSI
  • He X-C, Iyer S, Sipilä M, Ylisirniö A, Peltola M, Kontkanen J, et al.
    Determination of the collision rate coefficient between charged iodic acid clusters and iodic acid using the appearance time method
    Aerosol Science and Technology. 2021; 55(2): 231-242. https://doi.org/10.1080/02786826.2020.1839013
    DORA PSI
  • He X-C, Tham YJ, Dada L, Wang M, Finkenzeller H, Stolzenburg D, et al.
    Role of iodine oxoacids in atmospheric aerosol nucleation
    Science. 2021; 371(6529): 589-595. https://doi.org/10.1126/science.abe0298
    DORA PSI
  • Jiang J, El Haddad I, Aksoyoglu S, Stefenelli G, Bertrand A, Marchand N, et al.
    Influence of biomass burning vapor wall loss correction on modeling organic aerosols in Europe by CAMx v6.50
    Geoscientific Model Development. 2021; 14(3): 1681-1697. https://doi.org/10.5194/gmd-14-1681-2021
    DORA PSI
  • Lamkaddam H, Dommen J, Ranjithkumar A, Gordon H, Wehrle G, Krechmer J, et al.
    Large contribution to secondary organic aerosol from isoprene cloud chemistry
    Science Advances. 2021; 7(13): eabe2952 (10 pp.). https://doi.org/10.1126/sciadv.abe2952
    DORA PSI
  • Moschos V, Gysel-Beer M, Modini RL, Corbin JC, Massabò D, Costa C, et al.
    Source-specific light absorption by carbonaceous components in the complex aerosol matrix from yearly filter-based measurements
    Atmospheric Chemistry and Physics. 2021; 21(17): 12809-12833. https://doi.org/10.5194/acp-21-12809-2021
    DORA PSI
  • Ni H, Huang R-J, Pieber SM, Corbin JC, Stefenelli G, Pospisilova V, et al.
    Brown carbon in primary and aged coal combustion emission
    Environmental Science and Technology. 2021; 55(9): 5701-5710. https://doi.org/10.1021/acs.est.0c08084
    DORA PSI
  • Pospisilova V, Bell DM, Lamkaddam H, Bertrand A, Wang L, Bhattu D, et al.
    Photodegradation of α-pinene secondary organic aerosol dominated by moderately oxidized molecules
    Environmental Science and Technology. 2021; 55(10): 6936-6943. https://doi.org/10.1021/acs.est.0c06752
    DORA PSI
  • Rai P, Slowik JG, Furger M, El Haddad I, Visser S, Tong Y, et al.
    Highly time-resolved measurements of element concentrations in PM10 and PM2.5: comparison of Delhi, Beijing, London, and Krakow
    Atmospheric Chemistry and Physics. 2021; 21(2): 717-730. https://doi.org/10.5194/acp-21-717-2021
    DORA PSI
  • Srivastava D, Daellenbach KR, Zhang Y, Bonnaire N, Chazeau B, Perraudin E, et al.
    Comparison of five methodologies to apportion organic aerosol sources during a PM pollution event
    Science of the Total Environment. 2021; 757: 143168 (12 pp.). https://doi.org/10.1016/j.scitotenv.2020.143168
    DORA PSI
  • Surdu M, Pospisilova V, Xiao M, Wang M, Mentler B, Simon M, et al.
    Molecular characterization of ultrafine particles using extractive electrospray time-of-flight mass spectrometry
    Environmental Science: Atmospheres. 2021; 1(6): 434-448. https://doi.org/10.1039/D1EA00050K
    DORA PSI
  • Tomaz S, Wang D, Zabalegui N, Li D, Lamkaddam H, Bachmeier F, et al.
    Structures and reactivity of peroxy radicals and dimeric products revealed by online tandem mass spectrometry
    Nature Communications. 2021; 12: 300 (9 pp.). https://doi.org/10.1038/s41467-020-20532-2
    DORA PSI
  • Yazdani A, Dudani N, Takahama S, Bertrand A, Prévôt ASH, El Haddad I, et al.
    Characterization of primary and aged wood burning and coal combustion organic aerosols in an environmental chamber and its implications for atmospheric aerosols
    Atmospheric Chemistry and Physics. 2021; 21(13): 10273-10293. https://doi.org/10.5194/acp-21-10273-2021
    DORA PSI
  • Belis CA, Pernigotti D, Pirovano G, Favez O, Jaffrezo JL, Kuenen J, et al.
    Evaluation of receptor and chemical transport models for PM10 source apportionment
    Atmospheric Environment: X. 2020; 5: 100053 (23 pp.). https://doi.org/10.1016/j.aeaoa.2019.100053
    DORA PSI
  • Daellenbach KR, Uzu G, Jiang J, Cassagnes LE, Leni Z, Vlachou A, et al.
    Sources of particulate-matter air pollution and its oxidative potential in Europe
    Nature. 2020; 587(7834): 414-419. https://doi.org/10.1038/s41586-020-2902-8
    DORA PSI
  • Esmaeilirad S, Lai A, Abbaszade G, Schnelle-Kreis J, Zimmermann R, Uzu G, et al.
    Source apportionment of fine particulate matter in a Middle Eastern Metropolis, Tehran-Iran, using PMF with organic and inorganic markers
    Science of the Total Environment. 2020; 705: 135330 (16 pp.). https://doi.org/10.1016/j.scitotenv.2019.135330
    DORA PSI
  • Heinritzi M, Dada L, Simon M, Stolzenburg D, Wagner AC, Fischer L, et al.
    Molecular understanding of the suppression of new-particle formation by isoprene
    Atmospheric Chemistry and Physics. 2020; 20(20): 11809-11821. https://doi.org/10.5194/acp-20-11809-2020
    DORA PSI
  • Jiang J, Aksoyoglu S, El Haddad I, Ciarelli G, Oikonomakis E, Denier van der Gon HAC, et al.
    Modelling organic aerosol in Europe: improved CAMx and contribution of anthropogenic and biogenic sources
    In: Mensink C, Gong W, Hakami A, eds. Air pollution modeling and its application XXVI. Springer proceedings in complexity. Cham: Springer; 2020:383-388. https://doi.org/10.1007/978-3-030-22055-6_61
    DORA PSI
  • Lee CP, Riva M, Wang D, Tomaz S, Li D, Perrier S, et al.
    Online aerosol chemical characterization by extractive electrospray ionization-ultrahigh-resolution mass spectrometry (EESI-Orbitrap)
    Environmental Science and Technology. 2020; 54(7): 3871-3880. https://doi.org/10.1021/acs.est.9b07090
    DORA PSI
  • Leni Z, Cassagnes LE, Daellenbach KR, El Haddad I, Vlachou A, Uzu G, et al.
    Oxidative stress-induced inflammation in susceptible airways by anthropogenic aerosol
    PLoS One. 2020; 15(11): e0233425 (17 pp.). https://doi.org/10.1371/journal.pone.0233425
    DORA PSI
  • Petäjä T, Duplissy E-M, Tabakova K, Schmale J, Altstädter B, Ancellet G, et al.
    Overview: integrative and comprehensive understanding on polar environments (iCUPE) - concept and initial results
    Atmospheric Chemistry and Physics. 2020; 20(14): 8551-8592. https://doi.org/10.5194/acp-20-8551-2020
    DORA PSI
  • Pospisilova V, Lopez-Hilfiker FD, Bell DM, El Haddad I, Mohr C, Huang W, et al.
    On the fate of oxygenated organic molecules in atmospheric aerosol particles
    Science Advances. 2020; 6(11): eaax8922 (11 pp.). https://doi.org/10.1126/sciadv.aax8922
    DORA PSI
  • Rai P, Furger M, El Haddad I, Kumar V, Wang L, Singh A, et al.
    Real-time measurement and source apportionment of elements in Delhi's atmosphere
    Science of the Total Environment. 2020; 742: 140332 (16 pp.). https://doi.org/10.1016/j.scitotenv.2020.140332
    DORA PSI
  • Simon M, Dada L, Heinritzi M, Scholz W, Stolzenburg D, Fischer L, et al.
    Molecular understanding of new-particle formation from α-pinene between -50 and +25 °C
    Atmospheric Chemistry and Physics. 2020; 20(15): 9183-9207. https://doi.org/10.5194/acp-20-9183-2020
    DORA PSI
  • Stolzenburg D, Simon M, Ranjithkumar A, Kürten A, Lehtipalo K, Gordon H, et al.
    Enhanced growth rate of atmospheric particles from sulfuric acid
    Atmospheric Chemistry and Physics. 2020; 20(12): 7359-7372. https://doi.org/10.5194/acp-20-7359-2020
    DORA PSI
  • Wang M, Chen D, Xiao M, Ye Q, Stolzenburg D, Hofbauer V, et al.
    Photo-oxidation of aromatic hydrocarbons produces low-volatility organic compounds
    Environmental Science and Technology. 2020; 54(13): 7911-7921. https://doi.org/10.1021/acs.est.0c02100
    DORA PSI
  • Wang M, Kong W, Marten R, He X-C, Chen D, Pfeifer J, et al.
    Rapid growth of new atmospheric particles by nitric acid and ammonia condensation
    Nature. 2020; 581(7807): 184-189. https://doi.org/10.1038/s41586-020-2270-4
    DORA PSI
  • Bhattu D, Zotter P, Zhou J, Stefenelli G, Klein F, Bertrand A, et al.
    Effect of stove technology and combustion conditions on gas and particulate emissions from residential biomass combustion
    Environmental Science and Technology. 2019; 53(4): 2209-2219. https://doi.org/10.1021/acs.est.8b05020
    DORA PSI
  • Corbin JC, Czech H, Massabò D, Buatier de Mongeot F, Jakobi G, Liu F, et al.
    Infrared-absorbing carbonaceous tar can dominate light absorption by marine-engine exhaust
    npj Climate and Atmospheric Science. 2019; 2: 12 (10 pp.). https://doi.org/10.1038/s41612-019-0069-5
    DORA PSI
  • Daellenbach KR, Kourtchev I, Vogel AL, Bruns EA, Jiang J, Petäjä T, et al.
    Impact of anthropogenic and biogenic sources on the seasonal variation in the molecular composition of urban organic aerosols: a field and laboratory study using ultra-high-resolution mass spectrometry
    Atmospheric Chemistry and Physics. 2019; 19(9): 5973-5991. https://doi.org/10.5194/acp-19-5973-2019
    DORA PSI
  • Huang R-J, Wang Y, Cao J, Lin C, Duan J, Chen Q, et al.
    Primary emissions versus secondary formation of fine particulate matter in the most polluted city (Shijiazhuang) in North China
    Atmospheric Chemistry and Physics. 2019; 19(4): 2283-2298. https://doi.org/10.5194/acp-19-2283-2019
    DORA PSI
  • Jiang J, Aksoyoglu S, Ciarelli G, Oikonomakis E, El-Haddad I, Canonaco F, et al.
    Effects of two different biogenic emission models on modelled ozone and aerosol concentrations in Europe
    Atmospheric Chemistry and Physics. 2019; 19(6): 3747-3768. https://doi.org/10.5194/acp-19-3747-2019
    DORA PSI
  • Jiang J, Aksoyoglu S, El-Haddad I, Ciarelli G, Denier van der Gon HAC, Canonaco F, et al.
    Sources of organic aerosols in Europe: a modeling study using CAMx with modified volatility basis set scheme
    Atmospheric Chemistry and Physics. 2019; 19(24): 15247-15270. https://doi.org/10.5194/acp-19-15247-2019
    DORA PSI
  • Klein F, Baltensperger U, Prévôt ASH, El Haddad I
    Quantification of the impact of cooking processes on indoor concentrations of volatile organic species and primary and secondary organic aerosols
    Indoor Air. 2019; 29(6): 926-942. https://doi.org/10.1111/ina.12597
    DORA PSI
  • Stefenelli G, Jiang J, Bertrand A, Bruns EA, Pieber SM, Baltensperger U, et al.
    Secondary organic aerosol formation from smoldering and flaming combustion of biomass: a box model parametrization based on volatility basis set
    Atmospheric Chemistry and Physics. 2019; 19(17): 11461-11484. https://doi.org/10.5194/acp-19-11461-2019
    DORA PSI
  • Vlachou A, Tobler A, Lamkaddam H, Canonaco F, Daellenbach KR, Jaffrezo J-L, et al.
    Development of a versatile source apportionment analysis based on positive matrix factorization: a case study of the seasonal variation of organic aerosol sources in Estonia
    Atmospheric Chemistry and Physics. 2019; 19(11): 7279-7295. https://doi.org/10.5194/acp-19-7279-2019
    DORA PSI
  • Vogel AL, Lauer A, Fang L, Arturi K, Bachmeier F, Daellenbach KR, et al.
    A comprehensive nontarget analysis for the molecular reconstruction of organic aerosol composition from glacier ice cores
    Environmental Science and Technology. 2019; 53(21): 12565-12575. https://doi.org/10.1021/acs.est.9b03091
    DORA PSI
  • Wang M, Huang R-J, Cao J, Dai W, Zhou J, Lin C, et al.
    Determination of n-alkanes, polycyclic aromatic hydrocarbons and hopanes in atmospheric aerosol: evaluation and comparison of thermal desorption GC-MS and solvent extraction GC-MS approaches
    Atmospheric Measurement Techniques. 2019; 12(9): 4779-4789. https://doi.org/10.5194/amt-12-4779-2019
    DORA PSI
  • Xing L, Wu J, Elser M, Tong S, Liu S, Li X, et al.
    Wintertime secondary organic aerosol formation in Beijing-Tianjin-Hebei (BTH): contributions of HONO sources and heterogeneous reactions
    Atmospheric Chemistry and Physics. 2019; 19(4): 2343-2359. https://doi.org/10.5194/acp-19-2343-2019
    DORA PSI
  • Ye Q, Wang M, Hofbauer V, Stolzenburg D, Chen D, Schervish M, et al.
    Molecular composition and volatility of nucleated particles from α-pinene oxidation between -50 °C and +25 °C
    Environmental Science and Technology. 2019; 53(21): 12357-12365. https://doi.org/10.1021/acs.est.9b03265
    DORA PSI
  • Zhou J, Elser M, Huang R-J, Krapf M, Fröhlich R, Bhattu D, et al.
    Predominance of secondary organic aerosol to particle-bound reactive oxygen species activity in fine ambient aerosol
    Atmospheric Chemistry and Physics. 2019; 19(23): 14703-14720. https://doi.org/10.5194/acp-19-14703-2019
    DORA PSI
  • Aksoyoglu S, Ciarelli G, El Haddad I, Baltensperger U, Prevot ASH
    Source apportionment of inorganic aerosols in Europe and role of biogenic VOC emissions
    In: Mensink C, Kallos G, eds. Air pollution modelling and its application XXV. Springer proceedings in complexity. Cham: Springer; 2018:375-379. https://doi.org/10.1007/978-3-319-57645-9_59
    DORA PSI
  • Bertrand A, Stefenelli G, Jen CN, Pieber SM, Bruns EA, Ni H, et al.
    Evolution of the chemical fingerprint of biomass burning organic aerosol during aging
    Atmospheric Chemistry and Physics. 2018; 18(10): 7607-7624. https://doi.org/10.5194/acp-18-7607-2018
    DORA PSI
  • Bertrand A, Stefenelli G, Pieber SM, Bruns EA, Temime-Roussel B, Slowik JG, et al.
    Influence of the vapor wall loss on the degradation rate constants in chamber experiments of levoglucosan and other biomass burning markers
    Atmospheric Chemistry and Physics. 2018; 18(15): 10915-10930. https://doi.org/10.5194/acp-18-10915-2018
    DORA PSI
  • Corbin JC, Pieber SM, Czech H, Zanatta M, Jakobi G, Massabò D, et al.
    Brown and black carbon emitted by a marine engine operated on heavy fuel oil and distillate fuels: optical properties, size distributions, and emission factors
    Journal of Geophysical Research D: Atmospheres. 2018; 123(11): 6175-6195. https://doi.org/10.1029/2017JD027818
    DORA PSI
  • Corbin JC, Mensah AA, Pieber SM, Orasche J, Michalke B, Zanatta M, et al.
    Trace metals in soot and PM2.5 from heavy-fuel-oil combustion in a marine engine
    Environmental Science and Technology. 2018; 52(11): 6714-6722. https://doi.org/10.1021/acs.est.8b01764
    DORA PSI
  • Daellenbach KR, El-Haddad I, Karvonen L, Vlachou A, Corbin JC, Slowik JG, et al.
    Insights into organic-Aerosol sources via a novel laser-desorption/ionization mass spectrometry technique applied to one year of PM10 samples from nine sites in central Europe
    Atmospheric Chemistry and Physics. 2018; 18(3): 2155-2174. https://doi.org/10.5194/acp-18-2155-2018
    DORA PSI
  • Elser M, El-Haddad I, Maasikmets M, Bozzetti C, Wolf R, Ciarelli G, et al.
    High contributions of vehicular emissions to ammonia in three European cities derived from mobile measurements
    Atmospheric Environment. 2018; 175: 210-220. https://doi.org/10.1016/j.atmosenv.2017.11.030
    DORA PSI
  • Frege C, Ortega IK, Rissanen MP, Praplan AP, Steiner G, Heinritzi M, et al.
    Influence of temperature on the molecular composition of ions and charged clusters during pure biogenic nucleation
    Atmospheric Chemistry and Physics. 2018; 18(1): 65-79. https://doi.org/10.5194/acp-18-65-2018
    DORA PSI
  • Huang R-J, Cheng R, Jing M, Yang L, Li Y, Chen Q, et al.
    Source-specific health risk analysis on particulate trace elements: coal combustion and traffic emission as major contributors in wintertime Beijing
    Environmental Science and Technology. 2018; 52(19): 10967-10974. https://doi.org/10.1021/acs.est.8b02091
    DORA PSI
  • Kiliç D, El Haddad I, Brem BT, Bruns E, Bozetti C, Corbin J, et al.
    Identification of secondary aerosol precursors emitted by an aircraft turbofan
    Atmospheric Chemistry and Physics. 2018; 18(10): 7379-7391. https://doi.org/10.5194/acp-18-7379-2018
    DORA PSI
  • Klein F, Pieber SM, Ni H, Stefenelli G, Bertrand A, Kilic D, et al.
    Characterization of gas-phase organics using proton transfer reaction time-of-flight mass spectrometry: residential coal combustion
    Environmental Science and Technology. 2018; 52(5): 2612-2617. https://doi.org/10.1021/acs.est.7b03960
    DORA PSI
  • Kumar NK, Corbin JC, Bruns EA, Massabó D, Slowik JG, Drinovec L, et al.
    Production of particulate brown carbon during atmospheric aging of residential wood-burning emissions
    Atmospheric Chemistry and Physics. 2018; 18(24): 17843-17861. https://doi.org/10.5194/acp-18-17843-2018
    DORA PSI
  • Li X, Wu J, Elser M, Feng T, Cao J, El-Haddad I, et al.
    Contributions of residential coal combustion to the air quality in Beijing-Tianjin-Hebei (BTH), China: a case study
    Atmospheric Chemistry and Physics. 2018; 18(14): 10675-10691. https://doi.org/10.5194/acp-18-10675-2018
    DORA PSI
  • Molteni U, Bianchi F, Klein F, El Haddad I, Frege C, Rossi MJ, et al.
    Formation of highly oxygenated organic molecules from aromatic compounds
    Atmospheric Chemistry and Physics. 2018; 18(3): 1909-1921. https://doi.org/10.5194/acp-18-1909-2018
    DORA PSI
  • Moschos V, Kumar NK, Daellenbach KR, Baltensperger U, Prévôt ASH, El Haddad I
    Source apportionment of brown carbon absorption by coupling ultraviolet-visible spectroscopy with aerosol mass spectrometry
    Environmental Science and Technology Letters. 2018; 5(6): 302-308. https://doi.org/10.1021/acs.estlett.8b00118
    DORA PSI
  • Pieber SM, Kumar NK, Klein F, Comte P, Bhattu D, Dommen J, et al.
    Gas-phase composition and secondary organic aerosol formation from standard and particle filter-retrofitted gasoline direct injection vehicles investigated in a batch and flow reactor
    Atmospheric Chemistry and Physics. 2018; 18(13): 9929-9954. https://doi.org/10.5194/acp-18-9929-2018
    DORA PSI
  • Salameh D, Pey J, Bozzetti C, El Haddad I, Detournay A, Sylvestre A, et al.
    Sources of PM2.5 at an urban-industrial Mediterranean city, Marseille (France): application of the ME-2 solver to inorganic and organic markers
    Atmospheric Research. 2018; 214: 263-274. https://doi.org/10.1016/j.atmosres.2018.08.005
    DORA PSI
  • Stolzenburg D, Fischer L, Vogel AL, Heinritzi M, Schervish M, Simon M, et al.
    Rapid growth of organic aerosol nanoparticles over a wide tropospheric temperature range
    Proceedings of the National Academy of Sciences of the United States of America PNAS. 2018; 115(37): 9122-9127. https://doi.org/10.1073/pnas.1807604115
    DORA PSI
  • Vlachou A, Daellenbach KR, Bozzetti C, Chazeau B, Salazar GA, Szidat S, et al.
    Advanced source apportionment of carbonaceous aerosols by coupling offline AMS and radiocarbon size-segregated measurements over a nearly 2-year period
    Atmospheric Chemistry and Physics. 2018; 18(9): 6187-6206. https://doi.org/10.5194/acp-18-6187-2018
    DORA PSI
  • Zhang Y-L, El-Haddad I, Huang R-J, Ho K-F, Cao J-J, Han Y, et al.
    Large contribution of fossil fuel derived secondary organic carbon to water soluble organic aerosols in winter haze in China
    Atmospheric Chemistry and Physics. 2018; 18(6): 4005-4017. https://doi.org/10.5194/acp-18-4005-2018
    DORA PSI
  • Zhou J, Bruns EA, Zotter P, Stefenelli G, Prévôt ASH, Baltensperger U, et al.
    Development, characterization and first deployment of an improved online reactive oxygen species analyzer
    Atmospheric Measurement Techniques. 2018; 11(1): 65-80. https://doi.org/10.5194/amt-11-65-2018
    DORA PSI
  • Zhou J, Zotter P, Bruns EA, Stefenelli G, Bhattu D, Brown S, et al.
    Particle-bound reactive oxygen species (PB-ROS) emissions and formation pathways in residential wood smoke under different combustion and aging conditions
    Atmospheric Chemistry and Physics. 2018; 18(10): 6985-7000. https://doi.org/10.5194/acp-18-6985-2018
    DORA PSI
  • Zhu Q, Huang X-F, Cao L-M, Wei L-T, Zhang B, He L-Y, et al.
    Improved source apportionment of organic aerosols in complex urban air pollution using the multilinear engine (ME-2)
    Atmospheric Measurement Techniques. 2018; 11(2): 1049-1060. https://doi.org/10.5194/amt-11-1049-2018
    DORA PSI
  • Aksoyoglu S, Ciarelli G, El-Haddad I, Baltensperger U, Prévôt ASH
    Secondary inorganic aerosols in Europe: sources and the significant influence of biogenic VOC emissions, especially on ammonium nitrate
    Atmospheric Chemistry and Physics. 2017; 17(12): 7757-7773. https://doi.org/10.5194/acp-17-7757-2017
    DORA PSI
  • Bei N, Wu J, Elser M, Feng T, Cao J, El-Haddad I, et al.
    Impacts of meteorological uncertainties on the haze formation in Beijing-Tianjin-Hebei (BTH) during wintertime: a case study
    Atmospheric Chemistry and Physics. 2017; 17(23): 14579-14591. https://doi.org/10.5194/acp-17-14579-2017
    DORA PSI
  • Bertrand A, Stefenelli G, Bruns EA, Pieber SM, Temime-Roussel B, Slowik JG, et al.
    Primary emissions and secondary aerosol production potential from woodstoves for residential heating: influence of the stove technology and combustion efficiency
    Atmospheric Environment. 2017; 169: 65-79. https://doi.org/10.1016/j.atmosenv.2017.09.005
    DORA PSI
  • Bozzetti C, Sosedova Y, Xiao M, Daellenbach KR, Ulevicius V, Dudoitis V, et al.
    Argon offline-AMS source apportionment of organic aerosol over yearly cycles for an urban, rural, and marine site in northern Europe
    Atmospheric Chemistry and Physics. 2017; 17(1): 117-141. https://doi.org/10.5194/acp-17-117-2017
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  • Bozzetti C, El Haddad I, Salameh D, Daellenbach KR, Fermo P, Gonzalez R, et al.
    Organic aerosol source apportionment by offline-AMS over a full year in Marseille
    Atmospheric Chemistry and Physics. 2017; 17(13): 8247-8268. https://doi.org/10.5194/acp-17-8247-2017
    DORA PSI
  • Bruns EA, Slowik JG, El Haddad I, Kilic D, Klein F, Dommen J, et al.
    Characterization of gas-phase organics using proton transfer reaction time-of-flight mass spectrometry: fresh and aged residential wood combustion emissions
    Atmospheric Chemistry and Physics. 2017; 17(1): 705-720. https://doi.org/10.5194/acp-17-705-2017
    DORA PSI
  • Ciarelli G, El Haddad I, Bruns E, Aksoyoglu S, Möhler O, Baltensperger U, et al.
    Constraining a hybrid volatility basis-set model for aging of wood-burning emissions using smog chamber experiments: a box-model study based on the VBS scheme of the CAMx model (v5.40)
    Geoscientific Model Development. 2017; 10(6): 2303-2320. https://doi.org/10.5194/gmd-10-2303-2017
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  • Ciarelli G, Aksoyoglu S, El Haddad I, Bruns EA, Crippa M, Poulain L, et al.
    Modelling winter organic aerosol at the European scale with CAMx: evaluation and source apportionment with a VBS parameterization based on novel wood burning smog chamber experiments
    Atmospheric Chemistry and Physics. 2017; 17(12): 7653-7669. https://doi.org/10.5194/acp-17-7653-2017
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  • Daellenbach KR, Stefenelli G, Bozzetti C, Vlachou A, Fermo P, Gonzalez R, et al.
    Long-term chemical analysis and organic aerosol source apportionment at nine sites in central Europe: source identification and uncertainty assessment
    Atmospheric Chemistry and Physics. 2017; 17(21): 13265-13282. https://doi.org/10.5194/acp-17-13265-2017
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  • Gentner DR, Jathar SH, Gordon TD, Bahreini R, Day DA, El Haddad I, et al.
    Review of urban secondary organic aerosol formation from gasoline and diesel motor vehicle emissions
    Environmental Science and Technology. 2017; 51(3): 1074-1093. https://doi.org/10.1021/acs.est.6b04509
    DORA PSI
  • Kilic D, Brem BT, Klein F, El-Haddad I, Durdina L, Rindlisbacher T, et al.
    Characterization of gas-phase organics using proton transfer reaction time-of-flight mass spectrometry: aircraft turbine engines
    Environmental Science and Technology. 2017; 51(7): 3621-3629. https://doi.org/10.1021/acs.est.6b04077
    DORA PSI
  • Krapf M, Künzi L, Allenbach S, Bruns EA, Gavarini I, El-Haddad I, et al.
    Wood combustion particles induce adverse effects to normal and diseased airway epithelia
    Environmental Science: Processes and Impacts. 2017; 19(4): 538-548. https://doi.org/10.1039/c6em00586a
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  • Platt SM, El Haddad I, Pieber SM, Zardini AA, Suarez-Bertoa R, Clairotte M, et al.
    Gasoline cars produce more carbonaceous particulate matter than modern filter-equipped diesel cars
    Scientific Reports. 2017; 7: 4926 (9 pp.). https://doi.org/10.1038/s41598-017-03714-9
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  • Stirnweis L, Marcolli C, Dommen J, Barmet P, Frege C, Platt SM, et al.
    Assessing the influence of NOx concentrations and relative humidity on secondary organic aerosol yields from α-pinene photo-oxidation through smog chamber experiments and modelling calculations
    Atmospheric Chemistry and Physics. 2017; 17(8): 5035-5061. https://doi.org/10.5194/acp-17-5035-2017
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  • Wang YC, Huang R-J, Ni HY, Chen Y, Wang QY, Li GH, et al.
    Chemical composition, sources and secondary processes of aerosols in Baoji city of northwest China
    Atmospheric Environment. 2017; 158: 128-137. https://doi.org/10.1016/j.atmosenv.2017.03.026
    DORA PSI
  • Wolf R, El-Haddad I, Slowik JG, Dällenbach K, Bruns E, Vasilescu J, et al.
    Contribution of bacteria-like particles to PM2.5 aerosol in urban and rural environments
    Atmospheric Environment. 2017; 160: 97-106. https://doi.org/10.1016/j.atmosenv.2017.04.001
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  • Zotter P, Herich H, Gysel M, El-Haddad I, Zhang Y, Močnik G, et al.
    Evaluation of the absorption Ångström exponents for traffic and wood burning in the Aethalometer-based source apportionment using radiocarbon measurements of ambient aerosol
    Atmospheric Chemistry and Physics. 2017; 17(6): 4229-4249. https://doi.org/10.5194/acp-17-4229-2017
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  • Bianchi F, Barmet P, Stirnweis L, El Haddad I, Platt SM, Saurer M, et al.
    Contribution of methane to aerosol carbon mass
    Atmospheric Environment. 2016; 141: 41-47. https://doi.org/10.1016/j.atmosenv.2016.06.036
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  • Bozzetti C, Daellenbach KR, Hueglin C, Fermo P, Sciare J, Kasper-Giebl A, et al.
    Size-resolved identification, characterization, and quantification of primary biological organic aerosol at a European rural site
    Environmental Science and Technology. 2016; 50(7): 3425-3434. https://doi.org/10.1021/acs.est.5b05960
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  • Bruns EA, El Haddad I, Slowik JG, Kilic D, Klein F, Baltensperger U, et al.
    Identification of significant precursor gases of secondary organic aerosols from residential wood combustion
    Scientific Reports. 2016; 6: 27881 (9 pp.). https://doi.org/10.1038/srep27881
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  • Byčenkienė S, Ulevicius V, Bozzetti C, Vlachou A, Plauškaitė K, Mordas G, et al.
    Fossil and non-fossil source contributions to atmospheric carbonaceous aerosols during extreme spring grassland fires in Eastern Europe
    Atmospheric Chemistry and Physics. 2016; 16(9): 5513-5529. https://doi.org/10.5194/acp-16-5513-2016
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  • Daellenbach KR, Bozzetti C, Křepelová A, Canonaco F, Wolf R, Zotter P, et al.
    Characterization and source apportionment of organic aerosol using offline aerosol mass spectrometry
    Atmospheric Measurement Techniques. 2016; 9(1): 23-39. https://doi.org/10.5194/amt-9-23-2016
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  • Elser M, Huang R-J, Wolf R, Slowik JG, Wang Q, Canonaco F, et al.
    New insights into PM2.5 chemical composition and sources in two major cities in China during extreme haze events using aerosol mass spectrometry
    Atmospheric Chemistry and Physics. 2016; 16(5): 3207-3225. https://doi.org/10.5194/acp-16-3207-2016
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  • Elser M, Bozzetti C, El-Haddad I, Maasikmets M, Teinemaa E, Richter R, et al.
    Urban increments of gaseous and aerosol pollutants and their sources using mobile aerosol mass spectrometry measurements
    Atmospheric Chemistry and Physics. 2016; 16(11): 7117-7134. https://doi.org/10.5194/acp-16-7117-2016
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  • Hoyle CR, Fuchs C, Jarvinen E, Saathoff H, Dias A, El Haddad I, et al.
    Aqueous phase oxidation of sulphur dioxide by ozone in cloud droplets
    Atmospheric Chemistry and Physics. 2016; 16(3): 1693-1712. https://doi.org/10.5194/acp-16-1693-2016
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  • Järvinen E, Ignatius K, Nichman L, Kristensen TB, Fuchs C, Hoyle CR, et al.
    Observation of viscosity transition in α-pinene secondary organic aerosol
    Atmospheric Chemistry and Physics. 2016; 16(7): 4423-4438. https://doi.org/10.5194/acp-16-4423-2016
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  • Klein F, Platt SM, Farren NJ, Detournay A, Bruns EA, Bozzetti C, et al.
    Characterization of gas-phase organics using proton transfer reaction time-of-flight mass spectrometry: cooking emissions
    Environmental Science and Technology. 2016; 50(3): 1243-1250. https://doi.org/10.1021/acs.est.5b04618
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  • Klein F, Farren NJ, Bozzetti C, Daellenbach KR, Kilic D, Kumar NK, et al.
    Indoor terpene emissions from cooking with herbs and pepper and their secondary organic aerosol production potential
    Scientific Reports. 2016; 6: 36623 (7 pp.). https://doi.org/10.1038/srep36623
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  • Krapf M, El Haddad I, Bruns EA, Molteni U, Daellenbach KR, Prévôt ASH, et al.
    Labile peroxides in secondary organic aerosol
    Chem. 2016; 1(4): 603-616. https://doi.org/10.1016/j.chempr.2016.09.007
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  • Pieber SM, El Haddad I, Slowik JG, Canagaratna MR, Jayne JT, Platt SM, et al.
    Inorganic salt interference on CO2+ in aerodyne AMS and ACSM organic aerosol composition studies
    Environmental Science and Technology. 2016; 50(19): 10494-10503. https://doi.org/10.1021/acs.est.6b01035
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  • Beekmann M, Prévôt ASH, Drewnick F, Sciare J, Pandis SN, Denier van der Gon HAC, et al.
    In situ, satellite measurement and model evidence on the dominant regional contribution to fine particulate matter levels in the Paris megacity
    Atmospheric Chemistry and Physics. 2015; 15(16): 9577-9591. https://doi.org/10.5194/acp-15-9577-2015
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  • Belis CA, Karagulian F, Amato F, Almeida M, Artaxo P, Beddows DCS, et al.
    A new methodology to assess the performance and uncertainty of source apportionment models II: the results of two European intercomparison exercises
    Atmospheric Environment. 2015; 123: 240-250. https://doi.org/10.1016/j.atmosenv.2015.10.068
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  • Bruns EA, Krapf M, Orasche J, Huang Y, Zimmermann R, Drinovec L, et al.
    Characterization of primary and secondary wood combustion products generated under different burner loads
    Atmospheric Chemistry and Physics. 2015; 15(5): 2825-2841. https://doi.org/10.5194/acp-15-2825-2015
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  • Bruns EA, El Haddad I, Keller A, Klein F, Kumar NK, Pieber SM, et al.
    Inter-comparison of laboratory smog chamber and flow reactor systems on organic aerosol yield and composition
    Atmospheric Measurement Techniques. 2015; 8(6): 2315-2332. https://doi.org/10.5194/amt-8-2315-2015
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  • Suarez-Bertoa R, Zardini AA, Platt SM, Hellebust S, Pieber SM, El Haddad I, et al.
    Primary emissions and secondary organic aerosol formation from the exhaust of a flex-fuel (ethanol) vehicle
    Atmospheric Environment. 2015; 117: 200-211. https://doi.org/10.1016/j.atmosenv.2015.07.006
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  • Wolf R, El Haddad I, Crippa M, Decesari S, Slowik JG, Poulain L, et al.
    Marine and urban influences on summertime PM2.5 aerosol in the Po basin using mobile measurements
    Atmospheric Environment. 2015; 120: 447-454. https://doi.org/10.1016/j.atmosenv.2015.09.007
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  • Zhang Y-L, Huang R-J, El Haddad I, Ho K-F, Cao J-J, Han Y, et al.
    Fossil vs. non-fossil sources of fine carbonaceous aerosols in four Chinese cities during the extreme winter haze episode of 2013
    Atmospheric Chemistry and Physics. 2015; 15(3): 1299-1312. https://doi.org/10.5194/acp-15-1299-2015
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  • Huang R-J, Li W-B, Wang Y-R, Wang QY, Jia WT, Ho K-F, et al.
    Determination of alkylamines in atmospheric aerosol particles: a comparison of gas chromatography-mass spectrometry and ion chromatography approaches
    Atmospheric Measurement Techniques. 2014; 7(7): 2027-2035. https://doi.org/10.5194/amt-7-2027-2014
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  • Huang R-J, Zhang Y, Bozzetti C, Ho K-F, Cao J-J, Han Y, et al.
    High secondary aerosol contribution to particulate pollution during haze events in China
    Nature. 2014; 514(7521): 218-222. https://doi.org/10.1038/nature13774
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  • Platt SM, Haddad I, Pieber SM, Huang R-J, Zardini AA, Clairotte M, et al.
    Two-stroke scooters are a dominant source of air pollution in many cities
    Nature Communications. 2014; 5: 3749 (7 pp.). https://doi.org/10.1038/ncomms4749
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  • Waked A, Afif C, Formenti P, Chevaillier S, El-Haddad I, Doussin J-F, et al.
    Characterization of organic tracer compounds in PM2.5 at a semi-urban site in Beirut, Lebanon
    Atmospheric Research. 2014; 143: 85-94. https://doi.org/10.1016/j.atmosres.2014.02.006
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  • Zardini AA, Platt SM, Clairotte M, El Haddad I, Temime-Roussel B, Marchand N, et al.
    Effects of alkylate fuel on exhaust emissions and secondary aerosol formation of a 2-stroke and a 4-stroke scooter
    Atmospheric Environment. 2014; 94: 307-315. https://doi.org/10.1016/j.atmosenv.2014.03.024
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  • Zotter P, El-Haddad I, Zhang Y, Hayes PL, Zhang X, Lin Y-H, et al.
    Diurnal cycle of fossil and nonfossil carbon using radiocarbon analyses during CalNex
    Journal of Geophysical Research D: Atmospheres. 2014; 119(11): 6818-6835. https://doi.org/10.1002/2013JD021114
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  • Zotter P, Ciobanu VG, Zhang YL, El-Haddad I, Macchia M, Daellenbach KR, et al.
    Radiocarbon analysis of elemental and organic carbon in Switzerland during winter-smog episodes from 2008 to 2012-Part 1: source apportionment and spatial variability
    Atmospheric Chemistry and Physics. 2014; 14(24): 13551-13570. https://doi.org/10.5194/acp-14-13551-2014
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  • Baltensperger U, Bruns E, Dommen J, El Haddad I, Heringa MF, Prévôt ASH, et al.
    Holzfeuerungen: eine bedeutende Quelle von Feinstaub in der Schweiz
    Schweizerische Zeitschrift für Forstwesen. 2013; 164(12): 420-427. https://doi.org/10.3188/szf.2013.0420
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  • Crippa M, El Haddad I, Slowik JG, DeCarlo PF, Mohr C, Heringa MF, et al.
    Identification of marine and continental aerosol sources in Paris using high resolution aerosol mass spectrometry
    Journal of Geophysical Research D: Atmospheres. 2013; 118(4): 1950-1963. https://doi.org/10.1002/jgrd.50151
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  • Crippa M, Canonaco F, Slowik JG, El Haddad I, DeCarlo PF, Mohr C, et al.
    Primary and secondary organic aerosol origin by combined gas-particle phase source apportionment
    Atmospheric Chemistry and Physics. 2013; 13(16): 8411-8426. https://doi.org/10.5194/acp-13-8411-2013
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  • El Haddad I, Marchand N, D'Anna B, Jaffrezo JL, Wortham H
    Functional group composition of organic aerosol from combustion emissions and secondary processes at two contrasted urban environments
    Atmospheric Environment. 2013; 75: 308-320. https://doi.org/10.1016/j.atmosenv.2013.04.019
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  • El Haddad I, D'Anna B, Temime-Roussel B, Nicolas M, Boreave A, Favez O, et al.
    Towards a better understanding of the origins, chemical composition and aging of oxygenated organic aerosols: case study of a Mediterranean industrialized environment, Marseille
    Atmospheric Chemistry and Physics. 2013; 13(15): 7875-7894. https://doi.org/10.5194/acp-13-7875-2013
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  • Platt SM, El Haddad I, Zardini AA, Clairotte M, Astorga C, Wolf R, et al.
    Secondary organic aerosol formation from gasoline vehicle emissions in a new mobile environmental reaction chamber
    Atmospheric Chemistry and Physics. 2013; 13(18): 9141-9158. https://doi.org/10.5194/acp-13-9141-2013
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  • Waked A, Afif C, Brioude J, Formenti P, Chevaillier S, El Haddad I, et al.
    Composition and source apportionment of organic aerosol in Beirut, Lebanon, during winter 2012
    Aerosol Science and Technology. 2013; 47(11): 1258-1266. https://doi.org/10.1080/02786826.2013.831975
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  • Liu Y, Siekmann F, Renard P, El Zein A, Salque G, El Haddad I, et al.
    Oligomer and SOA formation through aqueous phase photooxidation of methacrolein and methyl vinyl ketone
    Atmospheric Environment. 2012; 49: 123-129. https://doi.org/10.1016/j.atmosenv.2011.12.012
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  • Piot C, Jaffrezo J-L, Cozic J, Pissot N, El Haddad I, Marchand N, et al.
    Quantification of levoglucosan and its isomers by High Performance Liquid Chromatography-electrospray ionization tandem mass spectrometry and its applications to atmospheric and soil samples
    Atmospheric Measurement Techniques. 2012; 5(1): 141-148. https://doi.org/10.5194/amt-5-141-2012
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  • Baduel C, Monge ME, Voisin D, Jaffrezo J-L, George C, Haddad IE, et al.
    Oxidation of atmospheric humic like substances by ozone: a kinetic and structural analysis approach
    Environmental Science and Technology. 2011; 45(12): 5238-5244. https://doi.org/10.1021/es200587z
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