n Clean Air Journal = Tydskrif vir Skoon Lug - An overview of the Dynamic Air Pollution Prediction System (DAPPS)




The Dynamic Air Pollution Prediction System (DAPPS) is a modular computer based system that provides air quality forecasts in an urban environment. DAPPS was established by a South African consortium and has been set up as a pilot study in the City of Cape Town. The key components of DAPPS are a comprehensive spatially and temporally resolved emissions module, a prognostic meteorological module and a photochemical dispersion module. Collectively, this suite provides a predictive and powerful atmospheric chemistry capability that is not readily available in most air quality modelling and information systems. In preliminary validation, modelled concentrations of SO, NOx and O are compared with measured concentrations in the Cape Town monitoring network. Predicted and monitored NOx compare well and the temporal profile is determined largely by motor vehicle activity. The comparison for SO confirms that weaknesses exist in the temporal profile assigned to small point sources. Ozone compares favourably, but deficiencies are observed and are attributed to the speciation of VOCs.


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