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The study focused on the Highveld Priority Area (HPA) and as such included only the sources located in the HPA that were operational at the time of the study. As the Sasol Synfuels plants are located within this area, the emissions thereof were included in the model and the benefits associated with emission reduction from that facility were included in the calculations (point 1 and 4). Category 1.1 (in terms of the Air Quality Act section 21 regulations) sources that are not located in the Highveld Priority Area were not included in this study. The HPA was chosen as the area for analysis as it is a declared priority area with defined borders which hosts the majority of the sources that fall under category 1.1. The model domain was larger than the analysis area, but benefits were only calculated for populations residing in the priority area. We must emphasize that that analysis was done on concentration differences for the options, which would obviate or reduce to a minimum the effect of sources outside the modelling domain.

clean air journal

Authors' Response to Letter to the Editor "An Economic assessment of SO2 reduction from industrial sources on the highveld of South Africa" by Steyn and Kornelius