A Calculated Methodology of Regional Contributions Based on MM5-CAMx in Typical City: A 2006 Case Study of SO2 and Sulfate

A calculated methodology of regional contributions based on the MM5-CAMx model was developed to analyze the impact of different emission regions on urban air quality. Meteorological fields of January, April, July and October in 2006 were obtained by running the MM5 modeling system. The SO₂ source apportionment technology was used to investigate the influence of the regions on air quality in Tangshan. A K-means clustering algorithm was used to group these contribution rates into five clusters according to daily average concentration contribution of 120 days. Results indicate that the receptor-self as emission region has the important contribution to receptor sites, the pollution could be aggravated by local source emissions. Combined with the Tangshan emission inventory, the analysis shows that several industries are located in inappropriate sits. Additionally the SO₂ and PSO4 source apportionment study reveals a few differences from the contributions of emission regions.