遵义市PM10和PM2.5污染水平时间分布及其与气象条件的关系研究

对遵义市2014年1月1日-12月31日大气颗粒物在线监测数据分析结果表明,全年PM10和PM2.5质量浓度的变化幅度较大,但变化趋势相似,且具有较好的相关性,其中冬季>春季>秋季>夏季;日变化呈双峰特征分布,夜间峰值比中午峰值大,且夜间PM2.5浓度呈区域性变化特征.选取日平均气温、相对湿度及风速等气象因子,利用Spearman秩相关分析表明遵义市全年PM10和PM2.5质量浓度与气温、相对湿度及风速等气象条件均呈负相关.

Temporal Distribution of PM10 and PM2.5and Its Correlation with Meteorological Factors in Zunyi City

The monitoring results of the concentrations of PM10 and PM2.5 from January 1,2014 to December 31,2014 in Zunyi cityshowedthat, despite a large variation in concentration, they varied similarly and were well correlated.The annual concentrations of PM10 and PM2.5 varied in an descending order winter> spring> autumn> summer.The concentrations of PM10 and PM2.5 had a similar diurnal variation with two peak in the day, which the peak value at night was larger than that at midday, and a regional change of PM2.5 were showed at night.Using Spearman rank correlation analysis, the meteorological factors such as daily average temperature, relative humidity, wind speed, were chosen and their individual relationships with concentrations of PM10 and PM2.5 was studied.The results showed that the concentrations of PM10 and PM2.5 were negatively correlated with them.