Abstract: The seasonal variations of acid rain,pH value and concentrations of air pollutants and their correlation were analyzed on the basis of the monitoring data on the acid rain during 2005 and 2006 in the protected farmland area of Fulin,Nanchang City.Simultaneously the atmospheric concentrations of SO2,NO2,PM10 were measured.In order to understand the annual and seasonal characteristics of air pollutants transportation,conducted to identify the dominant wind direction over the protected farmland areas and the locations of major emission sources within the areas for controlling acid rain and SO2 pollution in Nanchang were statistically analyzed.The results showed that the pH of the acid rain in the protected farmland areas was highly significantly correlated with the atmospheric concentrations of SO2,NO2 and PM10 in the city districts.The dominant wind direction over the protected farmland areas was almost consistent with the location of major emission sources within the areas for controlling acid rain and SO2 pollution in Nanchang.These are the two major contributors to the seriousness of the acid rain in the protected farmland areas.It is necessary to take steps to reduce emission and use advanced techniques for desulphurization and removing dust by the factories upwind in order to protect the farmland environment.

Key words: Acid rain, Acid rain, SO2, NO2, PM10, Wind direction