西安地铁环境中PM_(10)、PM_(2.5)、CO_2污染水平分析

PM_(10),PM_(2. 5),CO_2 POLLUTION LEVEL ANALYSIS IN XI'AN METRO ENVIRONMENT

针对地铁环境空气污染状况,于2013年6月对西安地铁2号线各监测车站的站厅、站台、车厢及室外的PM10、PM2.5、CO2的污染水平进行了监测分析。结果表明:站厅、站台和车厢的PM10浓度均未超标;PM2.5浓度最大值分别为97.97,131.56,97.1μg/m3,超标率分别为30.6%、75.4%、29.5%,各监测站点细颗粒物污染较严重。车厢内部CO2最高浓度超过2 357 mg/m3,缺乏足够的新鲜空气来满足乘客的呼吸需求。对PM10和PM2.5源的相关性分析表明,站台和车厢环境中的颗粒物有强烈的相关性,二者有共同的来源。对站台和车厢环境中的PM10、PM2.5与室外环境的相关性分析表明,PM10有强烈的相关性(R2=0.83,0.78);PM2.5有较弱的相关性(R2=0.43,0.11)。各监测车站站台PM2.5/PM10为0.64~0.83,平均值为0.72;车厢PM2.5/PM10为0.68~0.85,平均值为0.78。

In order to learn the pollution in the tube,concentration of PM10,PM2. 5,CO2in each monitoring point in station hall,platform,carriage and outdoor on Xi' an metro line Ⅱ were monitored in June 2013. The results indicated that in the station hall,platform and carriage,PM10concentration doesn't exceeded the standard limit; but the maximum value of PM2. 5 were 97. 97,131. 56,97. 1 μg / m3and their exceeding rate were 30. 6%,75. 4% and 29. 5% respectively. The fine particulate matter pollution of each monitoring site is considerably serious. The highest concentration of CO2in the carriages is more than 2 357 mg / m3,so there is not enough fresh air to support the passengers' breathing. The correlation analysis of PM10and PM2. 5source shows that there is a strong correlation between the particles in platforms and carriages,and the two share a common source. The correlation analysis between PM10,PM2. 5in platforms and carriages environments and the outdoor environment indicated that PM10shows a strong correlation( R2= 0. 83,0. 78); PM2. 5shows a weaker correlation( R2= 0. 43, 0. 11). The PM2. 5/ PM10in platform of each monitoring station ranges from 0. 64 to 0. 83,with a mean value of 0. 72; the PM2. 5/ PM10in carriages ranges from 0. 68 to 0. 85,with a mean value of 0. 78.