SODAR Based Meteorological Sensor Network for Air Pollution Monitoring in Northern India

The atmospheric boundary layer (ABL) plays a significant role in defining the air-quality index of an environment. It determines the environmental capacity for the diffusion of atmospheric pollutants. The air-quality in a designated area is influenced by the local air pollution as well as the transported pollutants from remote locations. Estimation of mixing-height helps to determine the volume space in which the emitted pollutants are dispersed. The continuous and effective monitoring of mixing-height in real-time is a major concern for the research community. Sonic Detection and Ranging (sodar) is crucial for real-time and continuous determination of mixing-height. This paper proposes a novel Sodar-based meteorological sensor network (SMSN) with the Internet of Things (IoT) capability. In the SMSN, the temperature, relative humidity, and wind sensors are integrated with sodar and deployed to seven locations in Northern India. The sensors with IoT work as sensor nodes and provide accessibility to users for air-quality monitoring in real-time. The IoT-enabled SMSN displayed impressive standard uncertainty for data packet losses across all the sites and parameters. Additionally, correlation analysis is performed between the SMSN parameters and key air-pollutants of each sensor node. The correlation analysis shows good relevance between the regional parameters and Delhi's parameters. The integration of IoT with sodar and meteorological parameters is important for improving the overall decision-making and planning of Delhi's air quality.