2026 Richard C. Flagan: Environmental Sciences Researcher – H-Index, Publications & Awards

Discipline name	D-Index	World Ranking	Current World Ranking	National Ranking	Current National Ranking	Publications	Citations
Environmental Sciences	127	88	85	37	35	504	59875

Research.com Recognitions

2026 - Research.com Environmental Sciences in United States Leader Award
2025 - Research.com Environmental Sciences in United States Leader Award
2023 - Research.com Environmental Sciences in United States Leader Award
2010 - Member of the National Academy of Engineering For leadership in invention, measurement, production, and technology of aerosols.

Overview

Richard C. Flagan is affiliated with the California Institute of Technology in the United States. Their research focuses primarily on Earth and Planetary Sciences with a significant emphasis on Environmental Science. Their body of work spans numerous subfields including Atmospheric Science, Global and Planetary Change, Health, Toxicology and Mutagenesis, Pulmonary and Respiratory Medicine, and General Dentistry.

Their research topics cover a range of areas related to atmospheric chemistry and aerosols, atmospheric ozone and climate, atmospheric aerosols and clouds, air quality and health impacts, atmospheric and environmental gas dynamics, infection control and ventilation, and dental research related to COVID-19.

Recent notable papers by Richard C. Flagan include:

Rapid growth of new atmospheric particles by nitric acid and ammonia condensation (2020, Nature)
Coronavirus Disease 2019 Patients in Earlier Stages Exhaled Millions of Severe Acute Respiratory Syndrome Coronavirus 2 Per Hour (2020, Clinical Infectious Diseases)
Role of iodine oxoacids in atmospheric aerosol nucleation (2021, Science)
Molecular understanding of new-particle formation from α -pinene between −50 and +25 °C (2020, Atmospheric chemistry and physics)
Overview of measurements and current instrumentation for 1-10 nm aerosol particle number size distributions (2020, Journal of Aerosol Science)

Richard C. Flagan frequently collaborates with several coauthors, including Markku Kulmala, Neil M. Donahue, Katrianne Lehtipalo, Imad El Haddad, and Lubna Dada.

Their research has been published extensively in venues such as Atmospheric Chemistry and Physics, Zenodo (CERN European Organization for Nuclear Research), Environmental Science Atmospheres, Aerosol Science and Technology, and UEF eRepo (University of Eastern Finland).

In recognition of contributions to aerosol science and technology, Richard C. Flagan was awarded membership in the National Academy of Engineering in 2010 for leadership in invention, measurement, production, and technology of aerosols.

Best Publications

Gas/Particle Partitioning and Secondary Organic Aerosol Yields

Jay R. Odum;Thorsten Hoffmann;Frank Bowman;Don Collins

1825
Citations
Role of sulphuric acid, ammonia and galactic cosmic rays in atmospheric aerosol nucleation

Jasper Kirkby;Joachim Curtius;João Almeida;João Almeida;Eimear Dunne

1511
Citations
Reactive intermediates revealed in secondary organic aerosol formation from isoprene

Jason D Surratt;Arthur W.H. Chan;Nathan C. Eddingsaas;Man Nin Chan

1134
Citations
Ambient aerosol sampling using the Aerodyne Aerosol Mass Spectrometer

Jose L. Jimenez;Jose L. Jimenez;John T. Jayne;Quan Shi;Charles E. Kolb

1111
Citations
Molecular understanding of sulphuric acid-amine particle nucleation in the atmosphere

Joao Almeida;Joao Almeida;Siegfried Schobesberger;Andreas Kürten;Ismael K. Ortega

1084
Citations
Fundamentals of Air Pollution Engineering

Richard C. Flagan;John H. Seinfeld

1056
Citations
Formation of Organic Aerosols from the Oxidation of Biogenic Hydrocarbons

Thorsten Hoffmann;Jay R. Odum;Frank Bowman;Donald Collins

1041
Citations
Organic aerosol formation from the oxidation of biogenic hydrocarbons

Robert J. Griffin;David R. Cocker;Richard C. Flagan;John H. Seinfeld

949
Citations
Secondary organic aerosol formation from isoprene photooxidation.

Jesse H. Kroll;Nga L. Ng;Shane M. Murphy;Richard C. Flagan

930
Citations
Marine aerosol formation from biogenic iodine emissions

Colin D. O'Dowd;Colin D. O'Dowd;Jose L. Jimenez;Richard C. Bahreini;Richard C. Flagan

911
Citations
The role of low-volatility organic compounds in initial particle growth in the atmosphere

Jasmin Tröstl;Wayne K. Chuang;Hamish Gordon;Martin Heinritzi

853
Citations
Secondary organic aerosol formation from m-xylene, toluene, and benzene

N. L. Ng;J. H. Kroll;A. W. H. Chan;P. S. Chhabra

827
Citations
Ion-induced nucleation of pure biogenic particles

Jasper Kirkby;Jasper Kirkby;Jonathan Duplissy;Jonathan Duplissy;Kamalika Sengupta;Carla Frege

826
Citations
Organosulfate formation in biogenic secondary organic aerosol

Jason D. Surratt;Yadian Gómez-González;Arthur W. H. Chan;Reinhilde Vermeylen

766
Citations
Evidence for organosulfates in secondary organic aerosol.

Jason D. Surratt;Jesse H. Kroll;Tadeusz E. Kleindienst;Edward O. Edney

745
Citations
Chemical composition of secondary organic aerosol formed from the photooxidation of isoprene

Jason D. Surratt;Shane M. Murphy;Jesse H. Kroll;Nga L. Ng

744
Citations
The Atmospheric Aerosol-Forming Potential of Whole Gasoline Vapor

J. R. Odum;T. P. W. Jungkamp;R. J. Griffin;R. C. Flagan

703
Citations
Gas-phase ozone oxidation of monoterpenes: Gaseous and particulate products

Jianzhen Yu;David R. Cocker;Robert J. Griffin;Richard C. Flagan

690
Citations
Oxidation products of biogenic emissions contribute to nucleation of atmospheric particles.

Francesco Riccobono;Siegfried Schobesberger;Catherine E. Scott;Josef Dommen

634
Citations
Secondary Organic Aerosol from the Photooxidation of Aromatic Hydrocarbons: Molecular Composition

Hali J. L. Forstner;Richard C. Flagan;John H. Seinfeld

533
Citations
Global atmospheric particle formation from CERN CLOUD measurements

Eimear M. Dunne;Hamish Gordon;Andreas Kürten;João Almeida;João Almeida

514
Citations

Frequent Co-Authors

John H. Seinfeld California Institute of Technology

Jonathan Duplissy University of Helsinki

Katrianne Lehtipalo University of Helsinki

Armin Sorooshian University of Arizona

Haflidi H. Jonsson Naval Postgraduate School

Markku Kulmala University of Helsinki

Neil M. Donahue Carnegie Mellon University

Joachim Curtius Goethe University Frankfurt

Andreas Kürten Goethe University Frankfurt

Siegfried Schobesberger University of Eastern Finland

External Links

Personal website of Richard C. Flagan

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