University, Subject, Country, Region, World
University of Hong Kong 64 Scientists Subject Rankings - 2025
The AD Scientific Index (Alper-Doger Scientific Index) provides the most comprehensive analysis across 13 main fields and 197 sub-branches at global, national, and regional levels. These analyses are based on indicators such as the H-index, i10-index, and citation count, including their values from the last 6 years. As of Mar 10, 2025, the rankings are determined according to the Total H Index. BETA VERSION: The subject field rankings for the world, regions, countries, and universities are currently in their Beta phase. This is due to the exclusion of (998.570) scientists categorized under ‘Others’, whose profiles have yet to be determined, edited, or classified. As updates are made to these fields, the rankings will be adjusted accordingly. Note: Please keep this in mind while reviewing the rankings. For further details, explore our [University Subject Rankings].
* Total H IndexRankings
Ranking Based On Selection: 1
Environmental engineering
Membrane technology
Desalination
Water reuse
Metrics
H-Index
i10 Index
Citation Counts
119
349
46,187
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* Total H IndexRankings
Ranking Based On Selection: 2
Environmental Biotechnology
Environmental Microbiology
Environmental Microbiome
Biological Wastewater Treatment
Metrics
H-Index
i10 Index
Citation Counts
117
325
45,768
* Total H IndexRankings
Ranking Based On Selection: 3
Metrics
H-Index
i10 Index
Citation Counts
101
205
40,874
* Total H IndexRankings
Ranking Based On Selection: 4
Metal Ecotoxicology and Biogeochemistry
Metrics
H-Index
i10 Index
Citation Counts
93
496
32,166
* Total H IndexRankings
Ranking Based On Selection: 5
Urban Sustainability
Sustainable built environment
Carbon neutrality
Sustainability Science
Metrics
H-Index
i10 Index
Citation Counts
90
258
25,609
* Total H IndexRankings
Ranking Based On Selection: 6
Water quality and water supply
Wastewater treatment
Particle dynamics in water
Metrics
H-Index
i10 Index
Citation Counts
78
255
25,204
* Total H IndexRankings
Ranking Based On Selection: 7
Environmental epidemiology
air pollution and health
chemical carcinogenesis
Metrics
H-Index
i10 Index
Citation Counts
66
168
13,263
* Total H IndexRankings
Ranking Based On Selection: 8
Hydrogeology
Groundwater
Coastal Hydrogeology
Engineering Geology
HKU-DES
Metrics
H-Index
i10 Index
Citation Counts
56
164
9,369
* Total H IndexRankings
Ranking Based On Selection: 9
Wastewater Treatment
Microplastics and Nanoplastics
Resource Recovery
Environmental Engineering
Environmental Technology
Metrics
H-Index
i10 Index
Citation Counts
56
193
14,592
* Total H IndexRankings
Ranking Based On Selection: 10
air quality
sensor
instrumentation
public health
Metrics
H-Index
i10 Index
Citation Counts
52
107
10,407
360° Institutional Performance & Benchmarking Click Here for Live Demo
Through advanced, institution-specific analytics and benchmarking, gain data-driven strategic insights into your academic performance, global standing, and competitive strengths. Compare your institution with 20 similarly ranked institutions at city, country, regional, and global levels, as well as with those in similar standings across 13 subjects, to uncover your institution’s strengths. More Info
* Total H IndexRankings
Ranking Based On Selection: 11
Water
Membrane
and Energy
Metrics
H-Index
i10 Index
Citation Counts
49
119
8,401
* Total H IndexRankings
Ranking Based On Selection: 12
wastewater
sewer
treatment
reuse
Metrics
H-Index
i10 Index
Citation Counts
48
190
6,841
* Total H IndexRankings
Ranking Based On Selection: 13
Environmental Health
Epidemiology
Air Pollution
Metrics
H-Index
i10 Index
Citation Counts
46
82
5,060
* Total H IndexRankings
Ranking Based On Selection: 14
Indoor Air Quality
Aerosols
Metrics
H-Index
i10 Index
Citation Counts
45
98
7,668
* Total H IndexRankings
Ranking Based On Selection: 15
Environmental Engineering
Chemical Engineering
Biomass Conversion
Waste Valorization
Metrics
H-Index
i10 Index
Citation Counts
39
56
6,963
* Total H IndexRankings
Ranking Based On Selection: 16
Environmental Health
Life course/lifespan
Healthy cities
Chronic diseases
Cohort studies
Metrics
H-Index
i10 Index
Citation Counts
38
55
5,977
* Total H IndexRankings
Ranking Based On Selection: 17
Environmental Engineering
water reuse
membrane technology
Metrics
H-Index
i10 Index
Citation Counts
35
51
5,544
* Total H IndexRankings
Ranking Based On Selection: 18
energy policy
sustainable development
environmental policy
environmental management
Metrics
H-Index
i10 Index
Citation Counts
36
70
4,508
* Total H IndexRankings
Ranking Based On Selection: 19
Technology policy
water governance
health policy
Policy Design
Metrics
H-Index
i10 Index
Citation Counts
34
61
5,134
* Total H IndexRankings
Ranking Based On Selection: 20
climate change
regional climate modeling
climate change impact
Metrics
H-Index
i10 Index
Citation Counts
34
55
3,405
* Total H IndexRankings
Ranking Based On Selection: 21
Environmental Pollution
heavy metal
rice
phytoremediation
Metrics
H-Index
i10 Index
Citation Counts
33
61
6,836
* Total H IndexRankings
Ranking Based On Selection: 22
Environmental Planning
GIS
Air Pollution
Land Use Regression
Sustainable and Resilient Cities
Metrics
H-Index
i10 Index
Citation Counts
31
57
3,271
* Total H IndexRankings
Ranking Based On Selection: 23
non-uniform air distribution
(adaptive) thermal comfort
indoor air quality
low/zero energy buildings
ejector cooling
Metrics
H-Index
i10 Index
Citation Counts
31
53
2,365
* Total H IndexRankings
Ranking Based On Selection: 24
Environmental Sciences
Metrics
H-Index
i10 Index
Citation Counts
30
55
2,464
* Total H IndexRankings
Ranking Based On Selection: 25
Environmental pollution
Hydrology
Environmental education
Metrics
H-Index
i10 Index
Citation Counts
29
40
6,046
Chuyang Tang
University of Hong Kong
Pokfulam, Hong Kong
Metrics
H-Index
i10-Index
Citation Counts
119
349
46,187
Environmental engineering
Membrane technology
Desalination
Water reuse
Tong Zhang Hku
University of Hong Kong
Pokfulam, Hong Kong
Metrics
H-Index
i10-Index
Citation Counts
117
325
45,768
Environmental Biotechnology
Environmental Microbiology
Environmental Microbiome
Biological Wastewater Treatment
Ho Wing Kei
Metrics
H-Index
i10-Index
Citation Counts
101
205
40,874
Wen Xiong Wang
City University of Hong Kong
Kowloon, Hong Kong
Metrics
H-Index
i10-Index
Citation Counts
93
496
32,166
Metal Ecotoxicology and Biogeochemistry
Xiaoling Zhang
University of Hong Kong
Pokfulam, Hong Kong
Metrics
H-Index
i10-Index
Citation Counts
90
258
25,609
Urban Sustainability
Sustainable built environment
Carbon neutrality
Sustainability Science
Xiao Yan Li Xy Li
University of Hong Kong
Pokfulam, Hong Kong
Metrics
H-Index
i10-Index
Citation Counts
78
255
25,204
Water quality and water supply
Wastewater treatment
Particle dynamics in water
Linwei Tian
University of Hong Kong
Pokfulam, Hong Kong
Metrics
H-Index
i10-Index
Citation Counts
66
168
13,263
Environmental epidemiology
air pollution and health
chemical carcinogenesis
Jiu Jimmy Jiao 焦赳赳
University of Hong Kong
Pokfulam, Hong Kong
Metrics
H-Index
i10-Index
Citation Counts
56
164
9,369
Hydrogeology
Groundwater
Coastal Hydrogeology
Engineering Geology
HKU-DES
Yiu Fai Tsang
Metrics
H-Index
i10-Index
Citation Counts
56
193
14,592
Wastewater Treatment
Microplastics and Nanoplastics
Resource Recovery
Environmental Engineering
Environmental Technology
Zhi Ning
Metrics
H-Index
i10-Index
Citation Counts
52
107
10,407
air quality
sensor
instrumentation
public health
360° Institutional Performance & Benchmarking Click Here for Live Demo
Through advanced, institution-specific analytics and benchmarking, gain data-driven strategic insights into your academic performance, global standing, and competitive strengths. Compare your institution with 20 similarly ranked institutions at city, country, regional, and global levels, as well as with those in similar standings across 13 subjects, to uncover your institution’s strengths. More Info
Alicia Kyoungjin An
City University of Hong Kong
Kowloon, Hong Kong
Metrics
H-Index
i10-Index
Citation Counts
49
119
8,401
Water
Membrane
and Energy
Hong Qiu
Metrics
H-Index
i10-Index
Citation Counts
46
82
5,060
Environmental Health
Epidemiology
Air Pollution
Lai Alvin
City University of Hong Kong
Kowloon, Hong Kong
Metrics
H-Index
i10-Index
Citation Counts
45
98
7,668
Indoor Air Quality
Aerosols
Season Si Chen
City University of Hong Kong
Kowloon, Hong Kong
Metrics
H-Index
i10-Index
Citation Counts
39
56
6,963
Environmental Engineering
Chemical Engineering
Biomass Conversion
Waste Valorization
Cui Guo (郭萃)|Guo, C, C GUO
Metrics
H-Index
i10-Index
Citation Counts
38
55
5,977
Environmental Health
Life course/lifespan
Healthy cities
Chronic diseases
Cohort studies
Hao Guo 郭浩|Hao Guo, Guo Hao
University of Hong Kong
Pokfulam, Hong Kong
Metrics
H-Index
i10-Index
Citation Counts
35
51
5,544
Environmental Engineering
water reuse
membrane technology
Peter Hills
University of Hong Kong
Pokfulam, Hong Kong
Metrics
H-Index
i10-Index
Citation Counts
36
70
4,508
energy policy
sustainable development
environmental policy
environmental management
Xun Wu
Metrics
H-Index
i10-Index
Citation Counts
34
61
5,134
Technology policy
water governance
health policy
Policy Design
Eun Soon Im
Metrics
H-Index
i10-Index
Citation Counts
34
55
3,405
climate change
regional climate modeling
climate change impact
Wai Chin Li
Metrics
H-Index
i10-Index
Citation Counts
33
61
6,836
Environmental Pollution
heavy metal
rice
phytoremediation
Yuan Shi
Metrics
H-Index
i10-Index
Citation Counts
31
57
3,271
Environmental Planning
GIS
Air Pollution
Land Use Regression
Sustainable and Resilient Cities
Zhang Sheng
City University of Hong Kong
Kowloon, Hong Kong
Metrics
H-Index
i10-Index
Citation Counts
31
53
2,365
non-uniform air distribution
(adaptive) thermal comfort
indoor air quality
low/zero energy buildings
ejector cooling
Yuefei Ruan
City University of Hong Kong
Kowloon, Hong Kong
Metrics
H-Index
i10-Index
Citation Counts
30
55
2,464
Environmental Sciences
Lincoln Fok
Metrics
H-Index
i10-Index
Citation Counts
29
40
6,046
Environmental pollution
Hydrology
Environmental education