2026 Robert A. Harley: 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	71	1603	1525	680	626	154	16957

Robert A. Harley 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 Robert A. Harley sits on this spectrum.

41 publications 687+

This scientist: 154 publications — 44th percentile

44% of scientists in this discipline score the same or lower.

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

Robert A. Harley 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 Robert A. Harley sits on this spectrum.

30 D-Index 125+

This scientist: 71 D-Index — 84th percentile

84% of scientists in this discipline score the same or lower.

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

Overview

Robert A. Harley is affiliated with the University of California, Berkeley in the United States. Their research primarily focuses on environmental science, earth and planetary sciences, and engineering, with specific contributions across several subfields including health, toxicology and mutagenesis, atmospheric science, automotive engineering, pollution, and renewable energy, sustainability, and the environment.

Their work encompasses multiple topics, notably:

Air Quality and Health Impacts
Atmospheric chemistry and aerosols
Vehicle emissions and performance
Energy and Environment Impacts
Energy, Environment, and Transportation Policies
Air Quality Monitoring and Forecasting
Urban Transport and Accessibility

Frequent collaborators include Katelyn A. Yu, Brian McDonald, Wilson H. McNeil, Fan Tong, and Maximilian Auffhammer.

The most frequent publication venues for Robert A. Harley's research are:

Environmental Science & Technology
Nature Sustainability
Environmental Justice
ACS ES&T Air
ISEE Conference Abstracts

Recent publications demonstrate a focus on air pollution, vehicle emissions, and environmental equity. Notable papers include:

"Evaluation of Nitrogen Oxide Emission Inventories and Trends for On-Road Gasoline and Diesel Vehicles" (2021) published in Environmental Science & Technology
"Improved Spatial Resolution in Modeling of Nitrogen Oxide Concentrations in the Los Angeles Basin" (2023) published in Environmental Science & Technology
"Impact of truck electrification on air pollution disparities in the United States" (2025) published in Nature Sustainability
"Effects of Diesel Engine Emission Controls on Environmental Equity and Justice" (2021) published in Environmental Justice
"Corridor-Level Impacts of Battery-Electric Heavy-Duty Trucks and the Effects of Policy in the United States" (2023) published in Environmental Science & Technology

Best Publications

Volatile chemical products emerging as largest petrochemical source of urban organic emissions.

Brian C. McDonald;Brian C. McDonald;Joost A. De Gouw;Joost A. De Gouw;Jessica B. Gilman;Shantanu H. Jathar

1264
Citations
Secondary organic aerosol formation and transport

Spyros N. Pandis;Robert A. Harley;Glen R. Cass;John H. Seinfeld

816
Citations
Characterization of Polycyclic Aromatic Hydrocarbons in Motor Vehicle Fuels and Exhaust Emissions

Linsey C. Marr;and Thomas W. Kirchstetter;Robert A. Harley;Antonio H. Miguel

737
Citations
On-Road Emissions of Particulate Polycyclic Aromatic Hydrocarbons and Black Carbon from Gasoline and Diesel Vehicles

Antonio H. Miguel;Thomas W. Kirchstetter;Robert A. Harley;Susanne V. Hering

716
Citations
Elucidating secondary organic aerosol from diesel and gasoline vehicles through detailed characterization of organic carbon emissions

Drew R. Gentner;Gabriel Isaacman;David R. Worton;Arthur W. H. Chan

552
Citations
Review of Urban Secondary Organic Aerosol Formation from Gasoline and Diesel Motor Vehicle Emissions

Drew R. Gentner;Shantanu H. Jathar;Timothy D. Gordon;Timothy D. Gordon;Roya Bahreini

525
Citations
On-road measurement of fine particle and nitrogen oxide emissions from light- and heavy-duty motor vehicles

Thomas W. Kirchstetter;Robert A. Harley;Nathan M. Kreisberg;Mark R. Stolzenburg

456
Citations
Photochemical modeling of the Southern California air quality study

Robert A. Harley;Armistead G. Russell;Gregory J. McRae;Glen R. Cass

338
Citations
MOBILE SOURCES CRITICAL REVIEW 1998 NARSTO ASSESSMENT

R.F Sawyer;R.A Harley;S.H Cadle;J.M Norbeck

326
Citations
Long-term changes in emissions of nitrogen oxides and particulate matter from on-road gasoline and diesel vehicles

George A. Ban-Weiss;John P. McLaughlin;Robert A. Harley;Melissa M. Lunden

320
Citations
Spectral analysis of weekday–weekend differences in ambient ozone, nitrogen oxide, and non-methane hydrocarbon time series in California

Linsey C. Marr;Robert A. Harley

263
Citations
Quantifying sources of methane using light alkanes in the Los Angeles basin, California

J. Peischl;J. Peischl;T. B. Ryerson;J. Brioude;J. Brioude;K. C. Aikin;K. C. Aikin

256
Citations
Impact of Oxygenated Gasoline Use on California Light-Duty Vehicle Emissions

Thomas W. Kirchstetter;Brett C. Singer;Robert A. Harley;Gary R. Kendall

250
Citations
Influence of future climate and emissions on regional air quality in California

Allison L. Steiner;Shaheen Tonse;Shaheen Tonse;Ronald C. Cohen;Ronald C. Cohen;Allen H. Goldstein

249
Citations
A Preliminary Synthesis of Modeled Climate Change Impacts on U.S. Regional Ozone Concentrations

C. P. Weaver;X. Z. Liang;J. Zhu;P. J. Adams

247
Citations
Respeciation of organic gas emissions and the detection of excess unburned gasoline in the atmosphere

Robert A. Harley;Michael P. Hannigan;Glen R. Cass

247
Citations
Measurement of nitrous acid in motor vehicle exhaust

Thomas W. Kirchstetter;Robert A. Harley;David Littlejohn

247
Citations
On-Road Measurement of Ammonia and Other Motor Vehicle Exhaust Emissions

Andrew J. Kean;Robert A. Harley;David Littlejohn;Gary R. Kendall

237
Citations
Effects of Vehicle Speed and Engine Load on Motor Vehicle Emissions

Andrew J. Kean;Robert A. Harley;Gary R. Kendall

236
Citations
Evaluation of mobile source emission trends in the United States

Timothy R. Dallmann;Robert A. Harley

225
Citations

Frequent Co-Authors

Thomas W. Kirchstetter Lawrence Berkeley National Laboratory

Allen H. Goldstein University of California, Berkeley

Brett C. Singer Lawrence Berkeley National Laboratory

Drew R. Gentner Yale University

Jessica B. Gilman National Oceanic and Atmospheric Administration

Glen R. Cass California Institute of Technology

William C. Kuster National Oceanic and Atmospheric Administration

John S. Holloway National Oceanic and Atmospheric Administration

Carsten Warneke National Oceanic and Atmospheric Administration

Jeff Peischl Cooperative Institute for Research in Environmental Sciences

External Links

Personal website of Robert A. Harley

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