Air pollution is a common problem across the world. With the rapid development of industry, serious air pollution is caused by the discharged industrial waste gas. In addition, automobile exhaust, industrial waste gas, indoor pollution, etc. are also the main reasons of air pollution. When various toxic suspended substances reach a high concentration in the air, they can cause serious effects on people's bodies, such as asthma, pulmonary edema, and respiratory diseases.

Since human perception is limited, people inhale harmful gases unconsciously. Under such circumstances, in-depth research on the impact of air pollution on human health and real-time monitoring of gases is urgently needed. The types and concentrations of gases have different effects on the human body, and understanding the safety thresholds of various gases for humans is a significant step in preventing diseases. In addition, human exhalation is an important biometric for detecting disease. Volatile organic compounds (VOC) can be produced anywhere and can reflect physiological or pathological biochemical processes. To achieve rapid treatment, detecting exhaled gas can help detect diseases quickly and accurately.

This Special Issue is aimed at publishing research and development in the field of the effects of air pollution on human health and the relationship between exhaled gases and physical fitness characteristics of human, including the safety threshold of harmful gases to the human body, bodily diseases detected through exhaled gas, intelligent gas sensing technology, gas sensing materials, the application of the Internet of Things, and so on. Through this Special Issue, we hope to stimulate discussions on the impact of air pollution on the human body, real-time gas monitoring, and intelligent sensing using the Internet of Things. We welcome original research and review articles for this Special Issue.

Potential topics include but are not limited to the following:

• Threshold value of gas concentration for human safety
• Assessment of the impact of big data on human health
• Gas sensing methods for monitoring air pollution (gas chromatography, liquid chromatography, semiconductor sensors, chemical sensors, acoustic sensors, optical sensors, etc.)
• Gas sensing technology for detecting bodily diseases, such as NIOX MINO Exhaled Nitric Oxide Measurement System, NO Breath System, Electrochemical Sensors, Chemiluminescence Analyzers, Laser-Based Chemical Sensors
• Wearable gas sensor
• Gas sensing materials with enhanced sensing properties (metal oxides, carbon-based materials, conductive polymers, metal organic frameworks (MOFs), two-dimensional materials (black phosphorus, MXene), etc.)
• Application of intelligent systems in gas sensing (triboelectric nanogenerator (TENG), etc.)
• The application of the Internet of Things
• Real-time monitoring of gas in the air
• Linkage of data obtained by gas sensors to alarm equipment