In the present paper results of the study on gaseous loss of nitrogen from farmfields and wet deposition from the atmosphere in the recent years were reviewed and main pathways and amount of nitrogen emission, their influencing factors, and their hazard to the environment were discussed. Based on the results of the experiments on nitrogen gaseous loss from fields to the atmosphere and wet deposition of atmospheric nitrogen to the surface of the soil in the Taihu Lake Region, the effect of gaseous loss of chemical N fertilizers on the atmosphere and the water environment, and the factors driving the turn of acid rain of the sulfuric acid type into one of a mixed type of sulfuric acid and nitric acid were elaborated.