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World Scientist and University Rankings 2026
Singapore Engineering & Technology / Environmental Science & Engineering 72 Scientists Subject Rankings
The AD Scientific Index (Alper-Doger Scientific Index) provides the most comprehensive analysis across 13 main fields and 211 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 5 years. As of Jan 03, 2026, 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 (1.131.752) 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 Index Rankings
Rankings
8,822
World Rank
67
Country Rank
26
University
Ranking Based On Selection:
1
Engineering & Technology / Environmental Science & Engineering
Environmental microbiology and biotechnology | MBR | Biological wastewater treatmen
Environmental microbiology and biotechnology | MBR | Biological wastewater treatmen
H-Index Metrics
-
H-Index105
-
i10 Index335
-
Citation Counts41,854
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* Total H Index Rankings
Rankings
10,661
World Rank
80
Country Rank
33
University
Ranking Based On Selection:
2
Engineering & Technology / Environmental Science & Engineering
Environmental engineering | water | reuse | solid waste | recyclin
Environmental engineering | water | reuse | solid waste | recyclin
H-Index Metrics
-
H-Index100
-
i10 Index295
-
Citation Counts43,235
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* Total H Index Rankings
Rankings
18,324
World Rank
142
Country Rank
48
University
Ranking Based On Selection:
3
Engineering & Technology / Environmental Science & Engineering
Environmental Engineering | Environmental Science | Chemical Engineering | Nanomaterial
Environmental Engineering | Environmental Science | Chemical Engineering | Nanomaterial
H-Index Metrics
-
H-Index86
-
i10 Index200
-
Citation Counts26,548
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* Total H Index Rankings
Rankings
23,319
World Rank
181
Country Rank
95
University
Ranking Based On Selection:
4
Engineering & Technology / Environmental Science & Engineering
Cardiovascular diseases | Air pollution | Meta-analysi
Cardiovascular diseases | Air pollution | Meta-analysi
H-Index Metrics
-
H-Index80
-
i10 Index208
-
Citation Counts31,499
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* Total H Index Rankings
Rankings
33,382
World Rank
247
Country Rank
79
University
Ranking Based On Selection:
5
Engineering & Technology / Environmental Science & Engineering
wastewater treatment | recreational water quality | public health | environmental microbiology | biofilm
wastewater treatment | recreational water quality | public health | environmental microbiology | biofilm
H-Index Metrics
-
H-Index72
-
i10 Index170
-
Citation Counts18,249
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* Total H Index Rankings
Rankings
36,353
World Rank
271
Country Rank
90
University
Ranking Based On Selection:
6
* Total H Index Rankings
Rankings
36,721
World Rank
273
Country Rank
91
University
Ranking Based On Selection:
7
Engineering & Technology / Environmental Science & Engineering
Environmental Engineering | Membrane Separation | Environmental Nanotechnology | Water and Desalination | Environmental Material
Environmental Engineering | Membrane Separation | Environmental Nanotechnology | Water and Desalination | Environmental Material
H-Index Metrics
-
H-Index70
-
i10 Index178
-
Citation Counts18,098
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* Total H Index Rankings
Rankings
45,969
World Rank
347
Country Rank
186
University
Ranking Based On Selection:
8
Engineering & Technology / Environmental Science & Engineering
Water and Wastewater Treatment | Water Reuse | Membrane Technology | Green Infrastructur
Water and Wastewater Treatment | Water Reuse | Membrane Technology | Green Infrastructur
H-Index Metrics
-
H-Index65
-
i10 Index154
-
Citation Counts12,516
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* Total H Index Rankings
Rankings
48,949
World Rank
366
Country Rank
122
University
Ranking Based On Selection:
9
Engineering & Technology / Environmental Science & Engineering
Water and Wastewater Treatment | Waste Treatmen
Water and Wastewater Treatment | Waste Treatmen
H-Index Metrics
-
H-Index63
-
i10 Index181
-
Citation Counts13,588
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* Total H Index Rankings
Rankings
70,305
World Rank
511
Country Rank
271
University
Ranking Based On Selection:
10
Engineering & Technology / Environmental Science & Engineering
Environment | Optimization | Applied Mat
Environment | Optimization | Applied Mat
H-Index Metrics
-
H-Index56
-
i10 Index138
-
Citation Counts12,252
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* Total H Index Rankings
Rankings
72,340
World Rank
527
Country Rank
282
University
Ranking Based On Selection:
11
Engineering & Technology / Environmental Science & Engineering
Indoor Air Quality | building performance | energy | indoor environmen
Indoor Air Quality | building performance | energy | indoor environmen
H-Index Metrics
-
H-Index55
-
i10 Index129
-
Citation Counts13,836
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* Total H Index Rankings
Rankings
73,484
World Rank
533
Country Rank
286
University
Ranking Based On Selection:
12
Engineering & Technology / Environmental Science & Engineering
Environment and development | particularly low latitude
Environment and development | particularly low latitude
H-Index Metrics
-
H-Index55
-
i10 Index126
-
Citation Counts11,829
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* Total H Index Rankings
Rankings
84,253
World Rank
600
Country Rank
316
University
Ranking Based On Selection:
13
Engineering & Technology / Environmental Science & Engineering
Building science | energy | indoor air quality | ventilation | HVA
Building science | energy | indoor air quality | ventilation | HVA
H-Index Metrics
-
H-Index52
-
i10 Index118
-
Citation Counts13,286
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* Total H Index Rankings
Rankings
87,416
World Rank
614
Country Rank
204
University
Ranking Based On Selection:
14
Engineering & Technology / Environmental Science & Engineering
Wastewater treatment | constructed wetland | emerging contaminants | denitrification | soluble microbial produc
Wastewater treatment | constructed wetland | emerging contaminants | denitrification | soluble microbial produc
H-Index Metrics
-
H-Index51
-
i10 Index118
-
Citation Counts10,707
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* Total H Index Rankings
Rankings
96,602
World Rank
681
Country Rank
226
University
Ranking Based On Selection:
15
Engineering & Technology / Environmental Science & Engineering
Water Purification | Membranes | Carbon Nanotubes | Graphene | Carbon Nanoarchitecture
Water Purification | Membranes | Carbon Nanotubes | Graphene | Carbon Nanoarchitecture
H-Index Metrics
-
H-Index49
-
i10 Index81
-
Citation Counts10,023
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* Total H Index Rankings
Rankings
97,440
World Rank
693
Country Rank
1
University
Ranking Based On Selection:
16
Engineering & Technology / Environmental Science & Engineering
coffee | farming systems | climate change | sustainable agricultur
coffee | farming systems | climate change | sustainable agricultur
H-Index Metrics
-
H-Index49
-
i10 Index124
-
Citation Counts9,949
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* Total H Index Rankings
Rankings
124,445
World Rank
857
Country Rank
286
University
Ranking Based On Selection:
17
* Total H Index Rankings
Rankings
128,131
World Rank
885
Country Rank
455
University
Ranking Based On Selection:
18
Engineering & Technology / Environmental Science & Engineering
Water Resources | Hydrology | Hydroinformatics | Climate Chang
Water Resources | Hydrology | Hydroinformatics | Climate Chang
H-Index Metrics
-
H-Index44
-
i10 Index86
-
Citation Counts7,343
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* Total H Index Rankings
Rankings
129,377
World Rank
892
Country Rank
298
University
Ranking Based On Selection:
19
Engineering & Technology / Environmental Science & Engineering
water resources engineering | hydrology | climate change | flood modeling | green urban technolog
water resources engineering | hydrology | climate change | flood modeling | green urban technolog
H-Index Metrics
-
H-Index44
-
i10 Index107
-
Citation Counts5,734
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* Total H Index Rankings
Rankings
158,663
World Rank
1,065
Country Rank
530
University
Ranking Based On Selection:
20
Engineering & Technology / Environmental Science & Engineering
Environmental biology | microbial ecology | metabolomics | plant-microbe interactions | sys
Environmental biology | microbial ecology | metabolomics | plant-microbe interactions | sys
H-Index Metrics
-
H-Index40
-
i10 Index86
-
Citation Counts7,352
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* Total H Index Rankings
Rankings
158,850
World Rank
1,068
Country Rank
1
University
Ranking Based On Selection:
21
Engineering & Technology / Environmental Science & Engineering
Numerical Weather Prediction | Data Assimilation | Climate Science | Reanalysi
Numerical Weather Prediction | Data Assimilation | Climate Science | Reanalysi
H-Index Metrics
-
H-Index40
-
i10 Index66
-
Citation Counts29,239
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* Total H Index Rankings
Rankings
159,412
World Rank
1,071
Country Rank
373
University
Ranking Based On Selection:
22
Engineering & Technology / Environmental Science & Engineering
Environmental Technology | Water Treatment | Environmental Functional Material
Environmental Technology | Water Treatment | Environmental Functional Material
H-Index Metrics
-
H-Index40
-
i10 Index55
-
Citation Counts5,327
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* Total H Index Rankings
Rankings
175,349
World Rank
1,166
Country Rank
406
University
Ranking Based On Selection:
23
Engineering & Technology / Environmental Science & Engineering
Environmental Microbiology | Microbial Ecology | Extremophiles | Astrobiology | Environmental Healt
Environmental Microbiology | Microbial Ecology | Extremophiles | Astrobiology | Environmental Healt
H-Index Metrics
-
H-Index38
-
i10 Index59
-
Citation Counts6,711
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* Total H Index Rankings
Rankings
199,690
World Rank
1,294
Country Rank
2
University
Ranking Based On Selection:
24
* Total H Index Rankings
Rankings
203,369
World Rank
1,315
Country Rank
644
University
Ranking Based On Selection:
25
Engineering & Technology / Environmental Science & Engineering
Environmental biotechnology | Waste-to-resources | Biomass energy technolog
Environmental biotechnology | Waste-to-resources | Biomass energy technolog
H-Index Metrics
-
H-Index35
-
i10 Index56
-
Citation Counts4,094
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