【摘要】 采集2010—2012年东莞市城区5个采样点环境细粒子PM2.5,根据PM2.5浓度分析其污染特征,并结合气象要素分析其影响因素。研究表明:2010—2012年,东莞市城区各测点PM2.5年均浓度在0.035~0.054 mg/m3,PM2.5污染具有明显的夏季和非夏季2种季节性特征,夏季污染相对较轻,平均值为0.036 mg/m3,非夏季污染较严重,平均值达到0.053 mg/m3;PM2.5超标情况逐年好转,2010,2011,2012年超标率分别为20.3%、9.9%、4.6%。气象因素对PM2.5浓度变化有一定的影响,PM2.5浓度变化与风速呈一定程度的负相关,与相对湿度之间呈负相关关系,与气压之间呈正关系,而非夏季温度与其浓度变化关系不明显。更多还原

【Abstract】 Study on the pollution characteristics of PM2. 5in Dongguan and its influential factors( e. g. meteorological conditions) was conducted based on PM2. 5concentrations collected from 5 sampling locations around Dongguan between 2010 and 2012. The study showed that the annual average PM2. 5concentration varied from 0. 035 to 0. 054 mg / m3; the average PM2. 5concentration was 0. 053 mg / m3during non-summer seasons,which was higher than 0. 036 mg / m3during summer seasons; the exceedance rates of PM2. 5,compared to national standards,were 20. 3%,9. 9% and 4. 6% respectively in 2010,2011 and 2012. Moreover,the fine particle concentrations were also likely related to meteorological factors. The PM2. 5 concentrations were found to be inversely related with wind speed and relative humidity while positively related with atmospheric pressure. However,there was no evidence to show any relationship between temperature and PM2. 5concentrations during non-summer seasons.更多还原