Introduction 7315 1.1. Diversity of Monitoring Needs of Volatiles 7315 1.2. Chemical Interferences As the Key Noise Parameter for Wireless Sensors 7316 1.3. Goals and Scope of This Review 7317 1.4. Topics That Are Out of Scope of This Review 7317 2. Anatomy of Wireless Gas Sensors 7317 2.1. Active and Passive Wireless Sensors 7318 2.2. Transducers for Wireless Passive Sensors 7319 2.3. RFID Sensors 7320 2.4. Key Performance Factors of Wireless Sensors 7320 2.5. Summary of Specific Requirements for Wireless Gas Sensors 7321 3. Need for Transducers with Multiple Response Mechanisms 7321 3.1. Limitations of Sensor Arrays for Tethered and Wireless Gas Sensing 7322 3.2. Data Processing 7322 3.3. Multivariate Sensing 7323 4. Integration of Sensing Materials with Transducers 7323 6.3. System Approach for Development of Wireless Gas Sensors 7345 6.4. Path Forward 7345 Author Information 7346 Biographies 7346 Acknowledgment 7347 References 7347