南京市大气颗粒物污染特征及影响因素分析

Analysis on Pollution Characteristics and Influence Factors of Atmospheric Particulate Matters in Nanjing

利用南京市2013年12月至2014年11月PM2.5和PM10质量浓度及气象观测数据分析了大气颗粒物污染特征和影响因素。结果表明:过去一年南京市PM2.5、PM10年均值分别为0.082 0 mg/m3、0.133 3 mg/m3。季节性差异明显,污染程度顺序为:冬季>春季>秋季>夏季。南京大气颗粒物日变化呈"双峰双谷型"特征,峰值分别出现在上午11:00和晚间23:00附近,谷值分别出现在早晨7:00和下午18:00左右。颗粒物与温度、相对湿度、风速呈一定的负相关性,与能见度、气压有一定正相关性。气象条件共同影响颗粒物质量浓度和大气污染水平。

The pollution characteristics and influence factors of atmospheric particulate matters were analyzed based on PM2. 5 ＆ PMlo mass concentration and meteorological data during 2013/12 -2014/11 in Nanjing. Results showed that annual average of PM2.5 and PM10 were 0. 082 0 mg/m^3 and 0. 133 3 mg/m^3. Seasonal differences were significant,it showed the following trend Winter 〉 Spring 〉 Autumn 〉 Summer. The daily variation of particulate matter presented the ＇ Bimodal Dual Valley type＇ , two peaks were found nearly at 11：00 and 23：00, and valleys were close to 7：00 and 18：00. Between particulate matter and the temperature, the relative humidity, and the wind were negatively correlated, but the visibility and the pressure were positive correlated. These meteorological factors affected the concentration of particulate matter and air pollution levels together.