Evaluation of CO and NOx Distributions from Point (Industry) Sources in Körfez District of Kocaeli Province with ISCST3 Model

Abstract

This study was performed for the modelling of the distributions of CO and NO_x emissions emitted to the atmosphere from point sources in Körfez District of Kocaeli Province. ISCST3 (Industrial Source Complex Short Term) dispersion model approved by the EPA (US Environmental Protection Agency) was used for the study. The model uses steady state Gaussian plume flow equation for high point sources. Due to the nature of the steady-state condition, the model is able to predict distribution of emissions from point, area and volume sources within 50 km in a successful manner; therefore it is defined as a suitable model for estimating air quality. Accuracy of the estimates depends on the correct measurement of meteorological parameters in the study area, as well as the detailed and accurate emission inventory for all resources.

Körfez district has a number of pollutant sources including many industrial plants, ports and docks, railway and busy traffic arteries together with a high density of urbanisation. It is one of the most polluted sites in Kocaeli region and determination and monitoring of air quality here has a great importance. For this purpose, CO emissions emitted from 20 factory chimneys and NO_x emissions emitted from 15 factory chimneys were modelled and the daily and annual distribution maps were obtained.

The modelling study showed that the maximum ground-level CO concentrations were calculated as 335.24 μg/m³ and 70.02 μg/m³ in daily and annual basis respectively. On the other hand, for NO_x concentrations, daily and annual maximum values were calculated as 372.05 μg/m³ and 26.29 μg/m³ respectively.