Chalk is a widely used tool in classrooms. However, the dust produced by conventional chalk presents significant health risks. This study examines the variations in particulate matter concentration in classroom air across different teaching activities under the use of different types of chalk. It emphasizes the benefits of dust-free chalk over conventional chalk and provides an in-depth analysis. Notably, this study pioneers the application of laser-induced breakdown spectroscopy (LIBS) for real-time detection and compositional analysis of particulate matter in classroom environments. By leveraging LIBS, this research enhances the understanding of classroom air quality and expands the potential application of LIBS in environmental monitoring.
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