World's Best Scientists 2026 revealed!
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Environmental Sciences
Australia
2023

D-Index & Metrics

Environmental Sciences

D-Index
77
Citations
21180
World Ranking
1134
National Ranking
51

Microbiology

D-Index
67
Citations
17511
World Ranking
2257
National Ranking
79

Nicholas J. Ashbolt 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 Nicholas J. Ashbolt 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: 279 publications — 83rd percentile

83% of scientists in this discipline score the same or lower.

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

Nicholas J. Ashbolt 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 Nicholas J. Ashbolt 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: 77 D-Index — 89th percentile

89% 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

  • 2023 - Research.com Environmental Sciences in Australia Leader Award

Overview

Nicholas J. Ashbolt is affiliated with the University of South Australia in Australia and has contributed extensively to research in environmental science and related fields. Their work spans several interconnected domains within environmental and health sciences, focusing notably on microbial contaminants, antibiotic resistance, and water quality.

The scientist's recent publications cover a range of topics and have appeared in prominent journals. Key papers include:

  • Toward a Universal Unit for Quantification of Antibiotic Resistance Genes in Environmental Samples, 2023, Environmental Science & Technology
  • Knowledge Gaps in the Understanding of Antimicrobial Resistance in Canada, 2021, Frontiers in Public Health
  • Tenets of a holistic approach to drinking water-associated pathogen research, management, and communication, 2021, Water Research
  • Validating and optimizing the method for molecular detection and quantification of SARS-CoV-2 in wastewater, 2021, The Science of The Total Environment
  • Characterization of water treatment-resistant and multidrug-resistant urinary pathogenic Escherichia coli in treated wastewater, 2020, Water Research

The frequent coauthors collaborating with Ashbolt include Rafik Dey, Amy Pruden, Kerry A. Hamilton, Rasha Maal-Bared, and Qiaozhi Li. The consistent collaboration with these researchers indicates a network centered on environmental microbiology, water research, and public health microbiology.

Ashbolt has published regularly in several scientific venues, with notable repetition in:

  • Water Research
  • Journal of Water and Health
  • ACS ES&T Water
  • Environmental Science & Technology
  • The Science of The Total Environment

The academic fields covered by Ashbolt's research primarily focus on:

  • Environmental Science
  • Biochemistry, Genetics and Molecular Biology
  • Medicine

The subfields of study span:

  • Endocrinology
  • Infectious Diseases
  • Water Science and Technology
  • Pollution
  • Health, Toxicology and Mutagenesis

Ashbolt's research concentrates on several main topics, reflecting a multidisciplinary approach:

  • Legionella and Acanthamoeba research
  • Fecal contamination and water quality
  • SARS-CoV-2 detection and testing
  • Pharmaceutical and Antibiotic Environmental Impacts
  • Water Treatment and Disinfection
  • Antibiotic Resistance in Bacteria
  • Vibrio bacteria research studies

Best Publications

  • Microbial contamination of drinking water and disease outcomes in developing regions.

    Nicholas John Ashbolt

  • Survival of fecal microorganisms in marine and freshwater sediments.

    C. M. Davies;J. A. H. Long;M. Donald;N. J. Ashbolt

  • Human Health Risk Assessment (HHRA) for environmental development and transfer of antibiotic resistance.

    Nicholas J. Ashbolt;Alejandro Amézquita;Thomas Backhaus;Peter Borriello

  • Indicators of microbial water quality

    Nicholas J. Ashbolt;Willie O.K. Grabow;Mario Snozzi

  • Using faecal sterols from humans and animals to distinguish faecal pollution in receiving waters

    R. Leeming;A. Ball;N. Ashbolt;P. Nichols

  • Estimated human health risks from exposure to recreational waters impacted by human and non-human sources of faecal contamination.

    Jeffrey A. Soller;Mary E. Schoen;Timothy Bartrand;John E. Ravenscroft

  • Guidelines for the safe use of wastewater, excreta and greywater

    A. C. Chang;Genxing Pan;Takashi Asano;Stephanie Buechler

  • Fate and Transport of Surface Water Pathogens in Watersheds

    Christobel Ferguson;Ana Maria de Roda Husman;Nanda Altavilla;Daniel Deere

  • Microbial Contamination of Drinking Water and Human Health from Community Water Systems

    Nicholas J. Ashbolt

  • Relationships between indicators, pathogens and water quality in an estuarine system

    C.M. Ferguson;B.G. Coote;N.J. Ashbolt;I.M. Stevenson

  • The role of biofilms and protozoa in Legionella pathogenesis: implications for drinking water.

    H.Y. Lau;N.J. Ashbolt

  • Fate and transport of pathogens in lakes and reservoirs.

    Justin D. Brookes;Jason Antenucci;Matthew Hipsey;Michael D. Burch

  • Do Free-Living Amoebae in Treated Drinking Water Systems Present an Emerging Health Risk?

    Jacqueline M. Thomas;Nicholas J. Ashbolt

  • A sea change ahead for recreational water quality criteria

    Alexandria B. Boehm;Nicholas J. Ashbolt;John M. Colford;Lee E. Dunbar

  • Estimating the primary etiologic agents in recreational freshwaters impacted by human sources of faecal contamination.

    Jeffrey A. Soller;Timothy Bartrand;Nicholas J. Ashbolt;John Ravenscroft

  • Assessing Pathogen Risk to Swimmers at Non-Sewage Impacted Recreational Beaches

    Mary E Schoen;Nicholas J Ashbolt

  • Functional microbial diversity explains groundwater chemistry in a pristine aquifer

    Theodore M Flynn;Theodore M Flynn;Robert A Sanford;Hodon Ryu;Craig M Bethke

  • The efficacy of heat and chlorine treatment against thermotolerant Acanthamoebae and Legionellae.

    Michael V. Storey;Jadwiga Winiecka-krusnell;Nicholas J. Ashbolt;Thor-axel Stenström

  • Microbial risks from wastewater irrigation of salad crops: a screening-level risk assessment.

    S. R. Petterson;N. J. Ashbolt;A. Sharma

  • Bacteriophages as indicators of faecal pollution and enteric virus removal.

    Brian R. McMinn;Nicholas J. Ashbolt;Asja Korajkic

  • Risk analysis of drinking water microbial contamination versus disinfection by-products (DBPs).

    Nicholas John Ashbolt

Frequent Co-Authors

Jorge W. Santo Domingo
Jorge W. Santo Domingo Environmental Protection Agency
Yang Liu
Yang Liu University of Alberta
Gregory Peters
Gregory Peters Chalmers University of Technology
Jay L. Garland
Jay L. Garland Environmental Protection Agency
Richard M. Stuetz
Richard M. Stuetz University of New South Wales
Keith L. Williams
Keith L. Williams Macquarie University
Stuart J. Khan
Stuart J. Khan University of Sydney
Amy Pruden
Amy Pruden Virginia Tech
Orin C. Shanks
Orin C. Shanks Environmental Protection Agency
Peter L. Rogers
Peter L. Rogers University of New South Wales

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Related Online Degrees & Career Pathways

For students interested in Environmental Sciences, exploring related online degrees can broaden career opportunities and provide flexible learning options. Many professionals in the field also pursue interdisciplinary programs to enhance their expertise. For instance, some may consider fully funded dsw programs online to integrate community and environmental social work aspects.

If budget is a concern, there are budget friendly online general studies degree programs that offer foundational knowledge and transferable credits, serving as a stepping stone into specialized environmental science areas.

For those looking to complete their degrees with manageable coursework, some of the easy bachelor degrees may include options that still relate to environmental studies or natural sciences, allowing for a smoother academic path without compromising relevance.

Additionally, a popular choice closely aligned with Environmental Sciences is obtaining an online geology degrees. These programs provide critical insight into earth processes, essential for environmental research and careers such as conservation, resource management, and environmental consulting.

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