Temporal-spatial characteristics and source apportionment of PM2.5 as well as its associated chemical species in the Beijing-Tianjin-Hebei region of China
- We present the temp-spatial PM2.5 variations at four cities in BTH region of China.
- PM2.5 concentrations and its species show spatially similar variation in BTH region.
- PMF results indicate PM2.5 pollution is dominated by vehicle emissions in Beijing.
- Coal combustion plays a significant contribution on PM2.5 in LangFang and Baoding.
- Soil and construction dust constitute most important components of PM2.5 in TianJin.
北京冬季重污染过程大气细颗粒物 化学组成特征及来源分析
北京冬季 PM2．5维持在较高的水平，清洁天和霾天 PM2．5的平均浓度分别为 86．0 μg·m－3和 200．4 μg·m－3，其中 水溶性离子和有机物是主要组成。糖类和一元脂肪酸是 浓度最高的组成，其次为正构烷烃和多环芳烃，二元脂肪酸浓度最低，除二元脂肪酸外，其他检测的有机物均 为霾天高于清洁天，表明霾天有更多的一次有机物的排放