Abstract:
PM
2.5 samples of winter and summer were measured and WRF-CAMx modeling system was developed to simulate PM
2.5 and secondary inorganic ions in Beijing-Tianjin-Hebei to study pollution characteristics and regional transmission of PM
2.5 in Tangshan, which obtained PM
2.5 chemical components data and estimated the regional contribution to PM
2.5 and secondary inorganic ions. Results indicate the concentration of PM
2.5 are (117.9±56.6) μg/m
3 and (77.3±29.8) μg/m
3 and have the standard exceeding ratios of 65.0% and 41.7%, total water-soluble ions concentrations are (58.4±17.9) μg/m
3 and (42.6±23.6) μg/m
3, which account for 49.4% and 55.0% in winter and summer, representing major chemical components of PM
2.5. Cu, Zn, As, Sr, Cd, Sb, Pb mainly come from anthropogenic pollution sources, while the others such as Na, Mg come from crustal sources. The contribution of non-local sources to PM
2.5 was 26.9% and 31.1% in winter and summer respectively. The transmission effect of SIA was more significant compared to PM
2.5. The contribution of non-local sources to PM
2.5 and SIA in summer was higher than that in winter. The contribution of non-local sources had a certain degree of rise during the high concentration process. Stable atmospheric conditions, low wind speed and increasing coal emissions are main causes of heavy pollution process.