The detection and monitoring of odorants and/or chemical pollution in the environment have become a major challenge to scientific community of modern developed and developing countries of the world. Billions of tons of organic and inorganic chemical pollutants are released into the air, water, and soil annually resulting in widespread potential health hazards to plants, animals, and humans worldwide. Monitoring of environmental pollution is necessary and considered a crucial element in the assessment of air quality in cities and rural areas.

The field of environmental monitoring and control encompasses a broad range of activities, including the detection of a variety of gases—CO, NO_x, NH₃, and the particularly challenging case of CO₂. Sensing systems have been developed for all of these applications, but this special issue is focused on the employment of gas and liquid sensors, electronic noses/tongues, wireless sensor networks, and other systems to monitor and control airborne volatile compounds that are released when waste products are dumped in water, land, or air.

We invite authors to contribute original research articles as well as review articles related to the detection of volatile compounds in three levels: materials, devices, and systems.

Potential topics include, but are not limited to:

• VOC and odour sampling
• Materials for gas and liquid sensing
• Gas sensors using different technologies: resistive, gravimetric, optical, and magnetic
• Sensor selection and optimization
• Electronic noses
• Electronic tongues
• Wireless sensor networks
• Data processing techniques for gas sensors
• Odour control and abatement techniques
• Applications and case studies