中文摘要：

为探讨兰州市大气污染特征及其影响因素,对兰州市能源结构、空气污染物及大气颗粒物中水溶性离子进行研究,结果表明,兰州市能源结构以燃煤为主逐渐向多元化过度;重点工业废气排放量由2001年1 010.40亿m3增加到2007年1 406.54亿m3,废气污染物排放量具有波动性,而SO2和NOx等标污染负荷比远高于其他污染物;PM10、SO2和NO2浓度在采暖期高于其他月份,且PM10浓度受沙尘影响也较严重,而NO2浓度季节波动较小;由于沙尘天气影响,每年3-5月出现降尘峰值,硫酸盐化速率与SO2浓度呈正相关性,冬季浓度高于春夏秋季;大气颗粒物中水溶性离子冬春季浓度较夏秋季高,且主要富集在细颗粒物中,以SO42-浓度最高。

英文摘要：

To explore air pollution-characteristics and influence factors of Lanzhou City, Gansu Province, energy structure, air pollutants and water-soluble ions in atmospheric particulates were analyzed. Results showed that energy structure of the City was changing from mainly consuming coal to diversification. Major industries tailpipe emission was increasing from 1 010.40 hundred million m3 in 2001 to 1 406.54 hundred million m3 in 2007, and the emission of pollutants had volatility. But the equal-standard pollution load of SO2, NOx were much higher than other pollutants. The concentrations of PM10, SO2 and NO2 in heating period were higher than that in other months, with PM10 affected by sand-dust and small volatility of NO2 concentration in seasons. Because of the effect of sand-dust weather, the dustfall content appeared peak in March to May. The rate of sulfation had positive correlation with the concentration of SO2, besides it was higher in winter than in spring, summer and autumn. The concentration of water-soluble ions in atmospheric particulates were generally higher in winter and spring than that in summer and autumn, and most of which enriched in fine particulate matters, with the highest concentration as SO4^2-.