Based on the ultraviolet radiation observation data of Nanjing for 4 a, the characters of surface ultraviolet radiation intensity are analyzed. The effects of cloud, pollutant concentration and the phenomena of fog and haze on ultraviolet radiation intensity are also discussed. The results show that the maximum attenuation rate of ultraviolet radiation intensity effected by low-level cloud amounts can reach 58. 15%. And for opacus cloud, the attenuation rate is between 71% and 80%. Pollutant concentration is negatively correlated with ultraviolet radiation intensity and NO2 has the best correlation and amounts to -0. 39. Under cloudless sky, the attenuation rate of ultraviolet radiation intensity for heavy haze weather leads to more than 20% , and for dense fog, the attenuation rate is almost the half.%利用南京市2005 -02-2009-01共4 a的紫外线辐射观测资料,分析了到达地面的紫外线辐射强度的变化特征,并探讨了云、污染物浓度和雾、霾天气等对紫外线辐射强度的影响.结果表明,低云量对紫外线强度的衰减更明显,最大达58.15％,蔽光性云层对紫外线辐射强度的衰减可达71％ ～80％；紫外线辐射强度与污染物浓度呈负相关,其中与NO2的相关性最好,为-0.39；晴空条件下,严重霾对紫外线辐射强度的衰减率可达20％以上,浓雾对紫外线辐射强度的衰减接近50％.
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