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Analysis on the Characteristics and the Developing Trend of the Acid Rain in Nanjing

Zhang Qun,Yu Jing,Yu Yiyong(Nanjing Environmental Monitoring Central Station,Nanjing 210013,China)  
Basis on the data on raining monitoring between 2004 to 2008 in Nanjing,the essay is to analyze the annual precipitation data,precipitation pH,the acid rain frequency and the composition of the anion and cation sub-statistical,to study the type and the developing law of the acid rain in Nanjing,as well as the relations between the weather conditions and the acid rain.From the research we can see that the effect of the acid rain pollution in the city is decreasing.The major acid rain pollutants in the city are sulfuric acid.The city generally suffers the acid rain most in autumn,especially in September,follows by spring,winter and summer.The major cations in the rain are Ca2+ and NH+4,while the anions are SO2-4.Relative humidity and precipitation pH values were negatively correlated;the wind speed and the precipitation pH value were significantly correlated.
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