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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 02, 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
1,125
World Rank
26
Country Rank
1
University
Ranking Based On Selection:
1
Engineering & Technology / Environmental Science & Engineering
Environmental Soil Science & Biogeochemistr
Environmental Soil Science & Biogeochemistr
H-Index Metrics
-
H-Index177
-
i10 Index809
-
Citation Counts112,290
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* Total H Index Rankings
Rankings
2,184
World Rank
6
Country Rank
1
University
Ranking Based On Selection:
2
Engineering & Technology / Environmental Science & Engineering
Chemistry | Environmental Engineering | Green Chemistry | Chemical Engineering | Water Treatmen
Chemistry | Environmental Engineering | Green Chemistry | Chemical Engineering | Water Treatmen
H-Index Metrics
-
H-Index149
-
i10 Index1,114
-
Citation Counts108,276
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* Total H Index Rankings
Rankings
2,185
World Rank
70
Country Rank
2
University
Ranking Based On Selection:
3
Engineering & Technology / Environmental Science & Engineering
Water Treatment Processes | Environmental Nanotechnology | Advanced Oxidation | Membrane Technolog
Water Treatment Processes | Environmental Nanotechnology | Advanced Oxidation | Membrane Technolog
H-Index Metrics
-
H-Index149
-
i10 Index896
-
Citation Counts83,922
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* Total H Index Rankings
Rankings
2,878
World Rank
4
Country Rank
3
University
Ranking Based On Selection:
4
Engineering & Technology / Environmental Science & Engineering
Water Treatment | Waste to Value-added Product
Water Treatment | Waste to Value-added Product
H-Index Metrics
-
H-Index140
-
i10 Index567
-
Citation Counts104,009
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* Total H Index Rankings
Rankings
3,763
World Rank
137
Country Rank
1
University
Ranking Based On Selection:
5
Engineering & Technology / Environmental Science & Engineering
Groundwater | Hydrogeology | Hydrology | Earth Science
Groundwater | Hydrogeology | Hydrology | Earth Science
H-Index Metrics
-
H-Index131
-
i10 Index1,114
-
Citation Counts81,929
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* Total H Index Rankings
Rankings
3,851
World Rank
141
Country Rank
1
University
Ranking Based On Selection:
6
Engineering & Technology / Environmental Science & Engineering
Glacier energy and mass balance | Climate change at high altitude region | Glacier hydolog
Glacier energy and mass balance | Climate change at high altitude region | Glacier hydolog
H-Index Metrics
-
H-Index130
-
i10 Index1,229
-
Citation Counts88,194
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* Total H Index Rankings
Rankings
3,957
World Rank
143
Country Rank
2
University
Ranking Based On Selection:
7
Engineering & Technology / Environmental Science & Engineering
environmental science | chemical engineering | water treatment | catalysi
environmental science | chemical engineering | water treatment | catalysi
H-Index Metrics
-
H-Index129
-
i10 Index613
-
Citation Counts58,988
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* Total H Index Rankings
Rankings
4,170
World Rank
5
Country Rank
1
University
Ranking Based On Selection:
8
Engineering & Technology / Environmental Science & Engineering
Phytotoxicity and Phytoremidiation of heavy metals and industrial effluents | stress physiology | Environmental Science | biocha
Phytotoxicity and Phytoremidiation of heavy metals and industrial effluents | stress physiology | Environmental Science | biocha
H-Index Metrics
-
H-Index127
-
i10 Index632
-
Citation Counts63,402
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* Total H Index Rankings
Rankings
4,181
World Rank
39
Country Rank
7
University
Ranking Based On Selection:
9
Engineering & Technology / Environmental Science & Engineering
Environmental engineering | Membrane technology | Desalination | Water reus
Environmental engineering | Membrane technology | Desalination | Water reus
H-Index Metrics
-
H-Index127
-
i10 Index380
-
Citation Counts52,516
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* Total H Index Rankings
Rankings
4,196
World Rank
162
Country Rank
1
University
Ranking Based On Selection:
10
Engineering & Technology / Environmental Science & Engineering
Hydrological modeling and prediction | Surface water and groundwater interaction | Hydrological response to climate chang
Hydrological modeling and prediction | Surface water and groundwater interaction | Hydrological response to climate chang
H-Index Metrics
-
H-Index127
-
i10 Index1,102
-
Citation Counts73,633
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* Total H Index Rankings
Rankings
4,221
World Rank
42
Country Rank
1
University
Ranking Based On Selection:
11
Engineering & Technology / Environmental Science & Engineering
Photocatalysis | Solar fuel | Advanced oxidation process | Environmental chemistry | Environmental engineerin
Photocatalysis | Solar fuel | Advanced oxidation process | Environmental chemistry | Environmental engineerin
H-Index Metrics
-
H-Index127
-
i10 Index344
-
Citation Counts82,016
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* Total H Index Rankings
Rankings
4,650
World Rank
178
Country Rank
1
University
Ranking Based On Selection:
12
Engineering & Technology / Environmental Science & Engineering
Environmental analytical chemistry | Environmental monitoring | the fate of pollutant
Environmental analytical chemistry | Environmental monitoring | the fate of pollutant
H-Index Metrics
-
H-Index124
-
i10 Index1,051
-
Citation Counts76,623
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* Total H Index Rankings
Rankings
4,913
World Rank
56
Country Rank
9
University
Ranking Based On Selection:
13
Engineering & Technology / Environmental Science & Engineering
Environmental Biotechnology | Environmental Microbiology | Environmental Microbiome | Sewage Surveillanc
Environmental Biotechnology | Environmental Microbiology | Environmental Microbiome | Sewage Surveillanc
H-Index Metrics
-
H-Index122
-
i10 Index350
-
Citation Counts51,256
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* Total H Index Rankings
Rankings
5,041
World Rank
196
Country Rank
15
University
Ranking Based On Selection:
14
Engineering & Technology / Environmental Science & Engineering
Disinfection and DBPs | DBP precursors and characterization | nitrosamines | NOM | T&
Disinfection and DBPs | DBP precursors and characterization | nitrosamines | NOM | T&
H-Index Metrics
-
H-Index121
-
i10 Index1,008
-
Citation Counts63,672
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* Total H Index Rankings
Rankings
5,042
World Rank
197
Country Rank
16
University
Ranking Based On Selection:
15
* Total H Index Rankings
Rankings
5,058
World Rank
200
Country Rank
4
University
Ranking Based On Selection:
16
Engineering & Technology / Environmental Science & Engineering
Water Treatment | Environmental Engineering | Environmental Nanotechnology | Bioremediatio
Water Treatment | Environmental Engineering | Environmental Nanotechnology | Bioremediatio
H-Index Metrics
-
H-Index121
-
i10 Index447
-
Citation Counts44,712
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* Total H Index Rankings
Rankings
5,220
World Rank
206
Country Rank
6
University
Ranking Based On Selection:
17
Engineering & Technology / Environmental Science & Engineering
Energy storage and conversion | Batteries | Li-S battery | metal air battery | Na ion batter
Energy storage and conversion | Batteries | Li-S battery | metal air battery | Na ion batter
H-Index Metrics
-
H-Index120
-
i10 Index511
-
Citation Counts49,869
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* Total H Index Rankings
Rankings
5,406
World Rank
220
Country Rank
17
University
Ranking Based On Selection:
18
* Total H Index Rankings
Rankings
5,791
World Rank
234
Country Rank
1
University
Ranking Based On Selection:
19
Engineering & Technology / Environmental Science & Engineering
Soil remediation | Biochar | Waste management | Soil CN cycling | Water qualit
Soil remediation | Biochar | Waste management | Soil CN cycling | Water qualit
H-Index Metrics
-
H-Index117
-
i10 Index524
-
Citation Counts51,737
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* Total H Index Rankings
Rankings
5,801
World Rank
239
Country Rank
19
University
Ranking Based On Selection:
20
Engineering & Technology / Environmental Science & Engineering
Climate Change Economics | Ecological Economics | Emission Data Accountin
Climate Change Economics | Ecological Economics | Emission Data Accountin
H-Index Metrics
-
H-Index117
-
i10 Index300
-
Citation Counts50,195
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* Total H Index Rankings
Rankings
6,058
World Rank
264
Country Rank
3
University
Ranking Based On Selection:
21
* Total H Index Rankings
Rankings
6,415
World Rank
277
Country Rank
24
University
Ranking Based On Selection:
22
* Total H Index Rankings
Rankings
6,424
World Rank
279
Country Rank
7
University
Ranking Based On Selection:
23
* Total H Index Rankings
Rankings
6,876
World Rank
296
Country Rank
27
University
Ranking Based On Selection:
24
Engineering & Technology / Environmental Science & Engineering
POPs | Emerging Contaminants | PFAS | PPCP
POPs | Emerging Contaminants | PFAS | PPCP
H-Index Metrics
-
H-Index112
-
i10 Index340
-
Citation Counts38,990
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* Total H Index Rankings
Rankings
7,335
World Rank
321
Country Rank
29
University
Ranking Based On Selection:
25
Engineering & Technology / Environmental Science & Engineering
emission | atmospheric chemistry | health impacts | mercur
emission | atmospheric chemistry | health impacts | mercur
H-Index Metrics
-
H-Index110
-
i10 Index415
-
Citation Counts42,204
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Premium Data
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