1. Introduction 2. Inorganic nanomaterials 3. Molecular materials for gas sensors and sensor arrays 4. Carbon nanomaterials 5. Hybrid and 2D nanomaterials 6. Fabrication techniques for coupling advanced nanomaterials to transducers 7. CMOS-based resistive and FET devices for smart gas sensors 8. Optical devices 9. Resonant microcantilever devices for gas sensing 10. Advanced operating methods 11. Indoor air quality monitoring 12. Low-cost sensors for outdoor air quality monitoring 13. Monitoring perishable food 14. Point of care breath analysis systems 15. Concluding remarks and outlook