Part 1 - Environmental contaminants 1. Environmental pollution: a worldwide threat 2. Main inorganic pollutants and their risk to living beings 3. Main organic pollutants and their risk to living beings 4. Main biological contaminants endangering humans' health 5. The importance of detecting pollutants to sustainability Part 2 - Nanotechnology and pollutants' detection 6. Brief history of nanotechnology-based sensors 7. Optical nanotechnology-based sensors for environmental contaminants' detection 8. Electrochemical nanotechnology-based sensors for environmental contaminants' detection 9. Magnetic nanotechnology-based sensors for environmental contaminants' detection 10. Nanotechnology-based sensors' design and fabrication 11. Nano biosensors to detect environmental pollution Part 3 - Relevant pollutants and their detection by nanotechnology-based sensors 12. Pesticides detection by nanotechnology-based sensors 13. Heavy metal detection by nanotechnology-based sensors 14. Dyes detection by nanotechnology-based sensors 15. Toxic gases detection by nanotechnology-based sensors 16. Pharmaceuticals and other emerging contaminants' detection by nanotechnology-based sensors 17. Petroleum hydrocarbons detection by nanotechnology-based sensors 18. Pathogenic microbial contamination detection by nanotechnology-based sensors Part 4 - Important nanomaterials in nanotechnology-based sensors 19. Graphene-based sensors to detect environmental contaminants 20. Carbon nanotubes-based sensors to detect environmental contaminants 21. Quantum dots-based sensors to detect environmental contaminants 22. Magnetic Nanomaterials-based sensors to detect environmental contaminants 23. Non-magnetic nanoparticles-based sensor to detect environmental contaminants 24. Point-of-care nanotechnology-based sensors for environmental pollutants 25. Functionalization of nanomaterials to generate optimized nanotechnology-based sensors to pollutants' detection Part 5 - Relevant practical aspects related to nanotechnology-based sensors 26. Advantages and challenges of nanotechnology-based sensors 27. Scientific barriers on exploiting the maximum performance from nanomaterial in sensors and feasible strategies to overcome difficulties 28. Safety on the Management of Nanomaterials 29. Nanomaterial's biocompatibility 30. Economic and commercial aspects related to nanotechnology-based sensors 31. Sustainability and green nanomaterials on nanotechnology-based sensors