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Quantification of Periodicities in Fugitive Emission of Gases from Lyari Waterway

Authors: Rana Khalid Naeem, Asif Mansoor


Periodicities in the environmetric time series can be idyllically assessed by utilizing periodic models. In this communication fugitive emission of gases from open sewer channel Lyari which follows periodic behaviour are approximated by employing periodic autoregressive model of order p. The orders of periodic model for each season are selected through the examination of periodic partial autocorrelation or information criteria. The parameters for the selected order of season are estimated individually for each emitted air toxin. Subsequently, adequacies of fitted models are established by examining the properties of the residual for each season. These models are beneficial for schemer and administrative bodies for the improvement of implemented policies to surmount future environmental problems.

Keywords: goodness of fit, Exchange of Gases, Open Sewer Channel, PAR(p) Models, Periodicities, Season Wise Models

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