On-field test and data calibration of a low-cost sensor for fine particles exposure assessment

Our study validated low-cost optical PM sensors under a wide range of PM2.5 concentrations (8-167 μg/m³). Our findings indicated potential applicability of PM sensors in PM2.5 exposure assessment, and confirmed a need of calibration. Linear calibration methods may be sufficient for ambient monitoring using TEOM as a reference, while nonlinear calibration methods may be more appropriate for indoor monitoring using GM as a reference.