南阳市PM_(10)、PM_(2.5)污染特征及其与气象因子的关系

The Relationships of Pollution Characteristics of PM_(10),PM_(2.5) and Meteorological Parameters in Nanyang City

利用2015年1月1日至12月31日南水北调中线源头南阳市主城区5个国控空气质量监测站24 h自动连续采样的PM_(10)、PM_(2.5)质量浓度数据和同期气象要素观测数据,分析了南阳市大气颗粒物浓度的污染特征及其与气象因子的关系。结果表明:2015年南阳市PM_(10)、PM_(2.5)年均质量浓度分别为0.136、0.074 mg/m^3,超标率分别为31.8%、39.2%;PM_(10)、PM_(2.5)峰值均出现在1月,PM_(10)谷值出现在11月,PM_(2.5)谷值出现在9月;PM_(10)四季日变化均呈双峰型,而PM_(2.5)冬季日变化呈双峰型,其他季节无明显峰值;PM_(2.5)/PM_(10)值在43%~65%,均值54%;PM_(10)、PM_(2.5)与大气压呈显著正相关,与温度、相对湿度呈显著负相关,与风速、降水相关性不明显。

Based on the PM 10, PM2 5 mass concentration datas and the observed datas of meteoronational air quality monitorin/ stations in the main urban area of Nanyan/ City from January 1 , 2015 to relationship between pollution characteristics of atmospheric particulates concentration and meteorolo/ical factors were analyzed in this paper. The results showed that the mean annual concentrations of PM10, PM2 5 were 0. 136 m / /m 3, 0. 074 m / /m 3,which exceeded the standard limit of the ambient air quality standards 31. 8% ,39. 2% respectively. The monthly peak ofPM10,PM2 5 appeared in January,meanwhile their valley value appeared in November and September accordingly. Seasonalchan/es of PM10 were turned bimodal type,while the daily avera/e of PM2 5 was bimodal,and there other seasons. The ratio of p （ PM2 5） to p （ PM10） ran/ed from43% to 65% over the whole samplin/ internal, and avera/e ratio was 54%. The mass concentrations of PM10 and PM2 5 were positively correlated with air pressure,si/nificant negatively correlated with relative humidity, weakly correlated with wind speed and rainfall.