Road traffic is one of the primary sources of air pollution in urban areas and consequently causing health problems especially to those people who live close to the crowded roads. The objective of this study is to investigate the impact of traffic emission on Airport Road on the surrounding residential areas in Najaf, Iraq. To achieve this objective, a traffic survey, air quality and meteorological parameters were measured during morning times on both a weekend and a weekday at three different distances-50m, 100m and 150m from both sides (A and B) of the road. The air quality results showed that the traffic emission did not cause exceedances on the applicable standards for CO and NO2 at any of the sites during sampling period. The prediction results, using SCREEN model, showed that the maximum predicted concentrations of all three air pollutants (TVOC, CO and NO2) are under predicted for both cases (i.e., USEPA and EURO 6 emission factor) at all three distances from the road, except for NO2 at distances of 50m and 100m for both cases and the predictions of CO and NO2 using USEPA emission factor give much better results than those prediction using EURO 6 emission factor. Based on the results, the CO could be considered as the best indicator for identifying the traffic impact on surrounding residential areas.
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