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World Scientist and University Rankings 2026
Nigeria Engineering & Technology / Environmental Science & Engineering 650 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
182,397
World Rank
160
Country Rank
1
University
Ranking Based On Selection:
1
Engineering & Technology / Environmental Science & Engineering
Biomass and Bioenergy | Biofertilizer | Renewable and Sustainable Energy | Organic Agricultur
Biomass and Bioenergy | Biofertilizer | Renewable and Sustainable Energy | Organic Agricultur
H-Index Metrics
-
H-Index37
-
i10 Index78
-
Citation Counts4,133
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* Total H Index Rankings
Rankings
193,001
World Rank
181
Country Rank
9
University
Ranking Based On Selection:
2
Engineering & Technology / Environmental Science & Engineering
Adsorption | Wastewater treatment | Optimization using response surface methodolog
Adsorption | Wastewater treatment | Optimization using response surface methodolog
H-Index Metrics
-
H-Index36
-
i10 Index69
-
Citation Counts4,454
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* Total H Index Rankings
Rankings
227,898
World Rank
257
Country Rank
11
University
Ranking Based On Selection:
3
Engineering & Technology / Environmental Science & Engineering
Wastewater Biotreatment | Ecological Engineering | Resource Recovery | Environmental Engineering | Water Resources Engineerin
Wastewater Biotreatment | Ecological Engineering | Resource Recovery | Environmental Engineering | Water Resources Engineerin
H-Index Metrics
-
H-Index33
-
i10 Index79
-
Citation Counts3,466
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* Total H Index Rankings
Rankings
229,127
World Rank
266
Country Rank
6
University
Ranking Based On Selection:
4
* Total H Index Rankings
Rankings
255,241
World Rank
323
Country Rank
14
University
Ranking Based On Selection:
5
Engineering & Technology / Environmental Science & Engineering
Nanotechnology | Polymer/Membrane Technology | Environmental Engineering | Corrosion Engineerin
Nanotechnology | Polymer/Membrane Technology | Environmental Engineering | Corrosion Engineerin
H-Index Metrics
-
H-Index31
-
i10 Index63
-
Citation Counts3,618
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* Total H Index Rankings
Rankings
257,295
World Rank
333
Country Rank
15
University
Ranking Based On Selection:
6
Engineering & Technology / Environmental Science & Engineering
water quality | water and wastewater treatment | solid waste managemen
water quality | water and wastewater treatment | solid waste managemen
H-Index Metrics
-
H-Index31
-
i10 Index64
-
Citation Counts3,235
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* Total H Index Rankings
Rankings
283,846
World Rank
403
Country Rank
1
University
Ranking Based On Selection:
7
Engineering & Technology / Environmental Science & Engineering
Bioremediation | Irrigation | Water pollution | Soil contaminatio
Bioremediation | Irrigation | Water pollution | Soil contaminatio
H-Index Metrics
-
H-Index30
-
i10 Index51
-
Citation Counts3,237
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* Total H Index Rankings
Rankings
309,407
World Rank
491
Country Rank
24
University
Ranking Based On Selection:
8
Engineering & Technology / Environmental Science & Engineering
Water management | Hydrology | Agrometeorology | Climate change | Echhydrolog
Water management | Hydrology | Agrometeorology | Climate change | Echhydrolog
H-Index Metrics
-
H-Index28
-
i10 Index56
-
Citation Counts3,830
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* Total H Index Rankings
Rankings
309,821
World Rank
492
Country Rank
58
University
Ranking Based On Selection:
9
Engineering & Technology / Environmental Science & Engineering
Climate and Society | Disaster Risk Reduction | Flood Hazards | Vulnerability and Resilience | Urban areas and Coastal zone
Climate and Society | Disaster Risk Reduction | Flood Hazards | Vulnerability and Resilience | Urban areas and Coastal zone
H-Index Metrics
-
H-Index28
-
i10 Index47
-
Citation Counts11,446
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* Total H Index Rankings
Rankings
331,396
World Rank
569
Country Rank
27
University
Ranking Based On Selection:
10
Engineering & Technology / Environmental Science & Engineering
wastewater treatment | phytoremediation | Irrigation & Drainage | food security | climate chang
wastewater treatment | phytoremediation | Irrigation & Drainage | food security | climate chang
H-Index Metrics
-
H-Index27
-
i10 Index48
-
Citation Counts2,533
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* Total H Index Rankings
Rankings
358,185
World Rank
653
Country Rank
1
University
Ranking Based On Selection:
11
Engineering & Technology / Environmental Science & Engineering
Environmetrics | Water quality | Statistical analysi
Environmetrics | Water quality | Statistical analysi
H-Index Metrics
-
H-Index26
-
i10 Index51
-
Citation Counts2,219
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* Total H Index Rankings
Rankings
370,341
World Rank
709
Country Rank
36
University
Ranking Based On Selection:
12
Engineering & Technology / Environmental Science & Engineering
Sustainable construction materials | Structures | Environmental sustainability | Engineering educatio
Sustainable construction materials | Structures | Environmental sustainability | Engineering educatio
H-Index Metrics
-
H-Index25
-
i10 Index57
-
Citation Counts2,061
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* Total H Index Rankings
Rankings
370,812
World Rank
714
Country Rank
19
University
Ranking Based On Selection:
13
Engineering & Technology / Environmental Science & Engineering
Environmental Biotechnology | Bioremediation | Environmental Microbiolog
Environmental Biotechnology | Bioremediation | Environmental Microbiolog
H-Index Metrics
-
H-Index25
-
i10 Index46
-
Citation Counts2,545
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* Total H Index Rankings
Rankings
392,191
World Rank
801
Country Rank
40
University
Ranking Based On Selection:
14
Engineering & Technology / Environmental Science & Engineering
Renewable Energy | Environmental Engineering | Corrosion Technology and Thermodynamic
Renewable Energy | Environmental Engineering | Corrosion Technology and Thermodynamic
H-Index Metrics
-
H-Index24
-
i10 Index53
-
Citation Counts2,124
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* Total H Index Rankings
Rankings
392,876
World Rank
805
Country Rank
74
University
Ranking Based On Selection:
15
Engineering & Technology / Environmental Science & Engineering
Water supply | water and wastewater treatment | environmental engineering | hydrolog
Water supply | water and wastewater treatment | environmental engineering | hydrolog
H-Index Metrics
-
H-Index24
-
i10 Index41
-
Citation Counts1,843
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* Total H Index Rankings
Rankings
407,830
World Rank
882
Country Rank
34
University
Ranking Based On Selection:
16
Engineering & Technology / Environmental Science & Engineering
Environmental Management | Environmental Health | Water quality assessment | Parasitology | Epidemiolog
Environmental Management | Environmental Health | Water quality assessment | Parasitology | Epidemiolog
H-Index Metrics
-
H-Index24
-
i10 Index35
-
Citation Counts2,162
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* Total H Index Rankings
Rankings
415,376
World Rank
916
Country Rank
45
University
Ranking Based On Selection:
17
Engineering & Technology / Environmental Science & Engineering
Environmental Forensics | Environmental Radioactivity | Radioecology | RadioProtection | Water Managemen
Environmental Forensics | Environmental Radioactivity | Radioecology | RadioProtection | Water Managemen
H-Index Metrics
-
H-Index23
-
i10 Index52
-
Citation Counts1,888
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* Total H Index Rankings
Rankings
450,089
World Rank
1,109
Country Rank
3
University
Ranking Based On Selection:
18
Engineering & Technology / Environmental Science & Engineering
Climatology | Climate Change | Environmental Resource Management
Climatology | Climate Change | Environmental Resource Management
H-Index Metrics
-
H-Index22
-
i10 Index33
-
Citation Counts2,085
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* Total H Index Rankings
Rankings
451,640
World Rank
1,114
Country Rank
105
University
Ranking Based On Selection:
19
Engineering & Technology / Environmental Science & Engineering
Water and Health | Enteric Pathogens | Antimicrobial Resistance | Wastewater-based Epidemiolog
Water and Health | Enteric Pathogens | Antimicrobial Resistance | Wastewater-based Epidemiolog
H-Index Metrics
-
H-Index22
-
i10 Index24
-
Citation Counts1,961
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* Total H Index Rankings
Rankings
461,750
World Rank
1,185
Country Rank
2
University
Ranking Based On Selection:
20
* Total H Index Rankings
Rankings
463,682
World Rank
1,196
Country Rank
3
University
Ranking Based On Selection:
21
Engineering & Technology / Environmental Science & Engineering
Environmental pollution management and ecosystem restoratio
Environmental pollution management and ecosystem restoratio
H-Index Metrics
-
H-Index22
-
i10 Index37
-
Citation Counts1,985
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* Total H Index Rankings
Rankings
483,294
World Rank
1,331
Country Rank
4
University
Ranking Based On Selection:
22
* Total H Index Rankings
Rankings
484,558
World Rank
1,339
Country Rank
57
University
Ranking Based On Selection:
23
Engineering & Technology / Environmental Science & Engineering
Environmental Biotechnology & Geomicrobiolog
Environmental Biotechnology & Geomicrobiolog
H-Index Metrics
-
H-Index21
-
i10 Index30
-
Citation Counts1,432
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* Total H Index Rankings
Rankings
496,267
World Rank
1,413
Country Rank
136
University
Ranking Based On Selection:
24
Engineering & Technology / Environmental Science & Engineering
Dev. Studies. | Environ Mgt & Control | Poll & Waste Mgt | Public Health | Industrializatio
Dev. Studies. | Environ Mgt & Control | Poll & Waste Mgt | Public Health | Industrializatio
H-Index Metrics
-
H-Index21
-
i10 Index41
-
Citation Counts1,627
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* Total H Index Rankings
Rankings
501,153
World Rank
1,449
Country Rank
30
University
Ranking Based On Selection:
25
Engineering & Technology / Environmental Science & Engineering
Environmental Engineering | Biosytems Engineering | Advanced Oxidation Processes | Sustainabilit
Environmental Engineering | Biosytems Engineering | Advanced Oxidation Processes | Sustainabilit
H-Index Metrics
-
H-Index20
-
i10 Index29
-
Citation Counts2,760
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