Dwipayana, M. Y., Pradipta, G. A., & Hostiadi, D. P. (2026). Safety-Oriented Air Quality Index Classification for Imbalanced Data Using Optimized Boosting Models with Optuna and Oversampling . TIERS Information Technology Journal, 7(1), 17-31. https://doi.org/10.38043/tiers.v7i1.7558