Environmental Protection Department Air Science and Modelling Group i Guidelines on Assessing the 'Total' Air Quality Impacts (Revised on 01-Jan-2023) ii Guidelines on Choice of Models and Model Parameters (Revised on 01-Jan-2023) iii Guidelines on the Use of Alternative Computer Models in Air Quality Assessment iv Guidelines on the Estimation of 10-minute Average SO2 Concentration for Air Quality Assessment in Hong Kong v PATH Documentation Executive Summary (Chinese) Executive Summary (English) Final Report Model Configuration Emission Information vi PATH Data Dissemination vii PATH Download