南京市某居民区空气 PM2.5和 PM10污染分布特征分析

目的：研究南京市某居民区空气PM2.5和PM10污染的分布特征。方法：于春、夏、秋、冬四季选取同一地点两个不同垂直高度，同步监测PM2.5和PM10两种颗粒物，其中PM10只于春、夏季采集。结果：南京某居民区PM10质量浓度较低，均未超过我国环境空气质量二级标准（GB3095-2012），秋冬季PM2.5超标，尤其是冬季最为严重。随着高度的增加，春季PM2.5质量浓度逐渐升高，而冬季PM2.5质量浓度则呈现下降的趋势，春冬季节不同高度PM2.5质量浓度差异有统计学意义（P＜0.05），而且工作日PM2.5质量浓度高于休息日。结论：冬季居民区空气PM2.5污染严重，尤其是在呼吸带高度，同时PM2.5在PM10中占很高的比例，建议南京市要采取相关措施以降低PM2.5污染程度。

Vertical distribution in air pollutants of a community in Nanjing

Objective：To study the distribution characteristics of PM 2.5 and PM10 pollution in a residential area of Nanjing .Methods： Two different vertical heights of same place were selected , and simultaneously the PM 2.5 sample were collected in spring , summer, autumn and winter, while the PM10 was only collected in spring and summer for some reason .Results：The concentrations of PM 10 were below the standard , while the concentrations of PM2.5 in autumn and winter exceeded , especially in winter , which was the most serious .With the height increased , the concentration of PM2.5 in spring increased gradually , it showed a downward trend in winter .At different heights, the difference of PM2.5 in spring and winter was statistically significant （P＆lt;0.05）, and the concentration of PM2.5 in weekday was higher than those in weekends＆#39;.Conclusion： The air pollution of PM 2.5 in winter is serious, especially in the breathing zone height .PM2.5 accounts for a high proportion in PM 10 .It is recommended to Nanjing to take measures to reduce the pollution levels of PM 2.5 .