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Environmental Sciences
USA
2026

D-Index & Metrics

Environmental Sciences

D-Index
127
Citations
59875
World Ranking
88
National Ranking
37

Richard C. Flagan publication distribution in Environmental Sciences in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Environmental Sciences in 2026. The highlighted bar marks where Richard C. Flagan sits on this spectrum.

41–50 publications: 21 scientists 51–60 publications: 62 scientists 61–70 publications: 133 scientists 71–80 publications: 257 scientists 81–90 publications: 361 scientists 91–100 publications: 440 scientists 101–110 publications: 492 scientists 111–120 publications: 541 scientists 121–130 publications: 617 scientists 131–140 publications: 544 scientists 141–150 publications: 541 scientists 151–160 publications: 539 scientists 161–170 publications: 444 scientists 171–180 publications: 444 scientists 181–190 publications: 400 scientists 191–200 publications: 377 scientists 201–210 publications: 318 scientists 211–220 publications: 283 scientists 221–230 publications: 263 scientists 231–240 publications: 220 scientists 241–250 publications: 217 scientists 251–260 publications: 180 scientists 261–270 publications: 181 scientists 271–280 publications: 155 scientists 281–290 publications: 130 scientists 291–300 publications: 127 scientists 301–310 publications: 130 scientists 311–320 publications: 85 scientists 321–330 publications: 106 scientists 331–340 publications: 80 scientists 341–350 publications: 83 scientists 351–360 publications: 75 scientists 361–370 publications: 69 scientists 371–380 publications: 52 scientists 381–390 publications: 54 scientists 391–400 publications: 56 scientists 401–410 publications: 44 scientists 411–420 publications: 40 scientists 421–430 publications: 36 scientists 431–440 publications: 25 scientists 441–450 publications: 25 scientists 451–460 publications: 32 scientists 461–470 publications: 29 scientists 471–480 publications: 21 scientists 481–490 publications: 26 scientists 491–500 publications: 25 scientists 501–510 publications: 17 scientists 511–520 publications: 18 scientists 521–530 publications: 15 scientists 531–540 publications: 22 scientists 541–550 publications: 12 scientists 551–560 publications: 15 scientists 561–570 publications: 11 scientists 571–580 publications: 19 scientists 581–590 publications: 9 scientists 591–600 publications: 9 scientists 601–610 publications: 7 scientists 611–620 publications: 11 scientists 621–630 publications: 5 scientists 631–640 publications: 5 scientists 641–650 publications: 6 scientists 651–660 publications: 3 scientists 661–670 publications: 3 scientists 671–680 publications: 4 scientists 681–686 publications: 3 scientists 687+ publications: 100 scientists
41 publications 687+

This scientist: 504 publications — 97th percentile

97% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 687 publications or more.

Richard C. Flagan D-index placement in Environmental Sciences in 2026

The chart shows the D-index (discipline H-index) distribution of Environmental Sciences scientists ranked by Research.com in 2026. The highlighted bar marks where Richard C. Flagan sits on this spectrum.

30 D-Index: 12 scientists 31 D-Index: 26 scientists 32 D-Index: 51 scientists 33 D-Index: 88 scientists 34 D-Index: 123 scientists 35 D-Index: 163 scientists 36 D-Index: 206 scientists 37 D-Index: 267 scientists 38 D-Index: 265 scientists 39 D-Index: 275 scientists 40 D-Index: 321 scientists 41 D-Index: 343 scientists 42 D-Index: 305 scientists 43 D-Index: 336 scientists 44 D-Index: 330 scientists 45 D-Index: 348 scientists 46 D-Index: 291 scientists 47 D-Index: 275 scientists 48 D-Index: 272 scientists 49 D-Index: 273 scientists 50 D-Index: 263 scientists 51 D-Index: 232 scientists 52 D-Index: 266 scientists 53 D-Index: 217 scientists 54 D-Index: 199 scientists 55 D-Index: 177 scientists 56 D-Index: 202 scientists 57 D-Index: 204 scientists 58 D-Index: 166 scientists 59 D-Index: 177 scientists 60 D-Index: 166 scientists 61 D-Index: 152 scientists 62 D-Index: 143 scientists 63 D-Index: 150 scientists 64 D-Index: 124 scientists 65 D-Index: 119 scientists 66 D-Index: 120 scientists 67 D-Index: 118 scientists 68 D-Index: 82 scientists 69 D-Index: 98 scientists 70 D-Index: 94 scientists 71 D-Index: 105 scientists 72 D-Index: 74 scientists 73 D-Index: 84 scientists 74 D-Index: 70 scientists 75 D-Index: 67 scientists 76 D-Index: 78 scientists 77 D-Index: 60 scientists 78 D-Index: 59 scientists 79 D-Index: 52 scientists 80 D-Index: 47 scientists 81 D-Index: 38 scientists 82 D-Index: 48 scientists 83 D-Index: 42 scientists 84 D-Index: 42 scientists 85 D-Index: 43 scientists 86 D-Index: 29 scientists 87 D-Index: 37 scientists 88 D-Index: 29 scientists 89 D-Index: 30 scientists 90 D-Index: 34 scientists 91 D-Index: 20 scientists 92 D-Index: 22 scientists 93 D-Index: 17 scientists 94 D-Index: 19 scientists 95 D-Index: 24 scientists 96 D-Index: 21 scientists 97 D-Index: 20 scientists 98 D-Index: 24 scientists 99 D-Index: 17 scientists 100 D-Index: 17 scientists 101 D-Index: 21 scientists 102 D-Index: 25 scientists 103 D-Index: 18 scientists 104 D-Index: 26 scientists 105 D-Index: 19 scientists 106 D-Index: 15 scientists 107 D-Index: 10 scientists 108 D-Index: 13 scientists 109 D-Index: 15 scientists 110 D-Index: 12 scientists 111 D-Index: 8 scientists 112 D-Index: 7 scientists 113 D-Index: 9 scientists 114 D-Index: 6 scientists 115 D-Index: 12 scientists 116 D-Index: 7 scientists 117 D-Index: 8 scientists 118 D-Index: 3 scientists 119 D-Index: 5 scientists 120 D-Index: 7 scientists 121 D-Index: 2 scientists 122 D-Index: 4 scientists 123 D-Index: 8 scientists 124 D-Index: 7 scientists 125+ D-Index: 99 scientists
30 D-Index 125+

This scientist: 127 D-Index — 99th percentile

99% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 125 D-Index or more.

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

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

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

  • Reactive intermediates revealed in secondary organic aerosol formation from isoprene

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

  • Ambient aerosol sampling using the Aerodyne Aerosol Mass Spectrometer

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

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

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

  • Fundamentals of Air Pollution Engineering

    Richard C. Flagan;John H. Seinfeld

  • Formation of Organic Aerosols from the Oxidation of Biogenic Hydrocarbons

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

  • Organic aerosol formation from the oxidation of biogenic hydrocarbons

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

  • Secondary organic aerosol formation from isoprene photooxidation.

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

  • Marine aerosol formation from biogenic iodine emissions

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

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

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

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

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

  • Ion-induced nucleation of pure biogenic particles

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

  • Organosulfate formation in biogenic secondary organic aerosol

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

  • Evidence for organosulfates in secondary organic aerosol.

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

  • Chemical composition of secondary organic aerosol formed from the photooxidation of isoprene

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

  • The Atmospheric Aerosol-Forming Potential of Whole Gasoline Vapor

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

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

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

  • Oxidation products of biogenic emissions contribute to nucleation of atmospheric particles.

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

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

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

  • Global atmospheric particle formation from CERN CLOUD measurements

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

Frequent Co-Authors

John H. Seinfeld
John H. Seinfeld California Institute of Technology
Jonathan Duplissy
Jonathan Duplissy University of Helsinki
Katrianne Lehtipalo
Katrianne Lehtipalo University of Helsinki
Armin Sorooshian
Armin Sorooshian University of Arizona
Haflidi H. Jonsson
Haflidi H. Jonsson Naval Postgraduate School
Markku Kulmala
Markku Kulmala University of Helsinki
Neil M. Donahue
Neil M. Donahue Carnegie Mellon University
Joachim Curtius
Joachim Curtius Goethe University Frankfurt
Andreas Kürten
Andreas Kürten Goethe University Frankfurt
Siegfried Schobesberger
Siegfried Schobesberger University of Eastern Finland

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