Hyperspectral Imaging Technology Empowering Dynamic Monitoring of VOCs: A Breakthrough High-Spatial-Temporal Resolution Detection Method.

Volatile organic compounds (VOCs) and their secondary pollutants pose significant risks to both the environment and human health. In response to air pollution control policies, the emissions of conventional pollutants, such as NO2 and SO2, have been preliminarily controlled. As a result, the reduction of VOC emissions has become a key measure for further improving air quality. Industrial activities are the primary anthropogenic source of VOCs, highlighting the urgent need for effective methods to detect VOC plume concentrations and monitor their dispersion and transport. This study proposes a hyperspectral rapid imaging system (HRIS), which achieves innovative advancements in noise removal, signal enhancement, and chromatic aberration correction. These breakthroughs enable, for the first time, high spatiotemporal resolution and synchronous observation of multiple VOC components, with final imaging results available within minutes. In two experimental setups, the system successfully measured the concentrations and emission fluxes of formaldehyde (HCHO), nitrobenzene (C6H5NO2), benzoic acid (CH3C6H3O2), nitrogen dioxide (NO2), and sulfur dioxide (SO2), with the highest emission flux recorded at 0.45 ± 0.13 kg/h. The application of HRIS facilitates the development of dynamic VOC emission inventories, providing critical data to support the design of future emission reduction strategies.