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A 2026 study published on ScienceDirect uses XGBoost and SHAP to analyze occupant-specific PM2.5cap P cap M sub 2.5

exposure in higher education buildings. While increasing airtightness can reduce average exposure by up to 32.3%, 88% of indoor zones still fail to meet WHO guidelines, indicating that structural improvements alone are insufficient for safe air quality. For more details, visit ScienceDirect. ScienceDirect.com