[Chemical Composition Characteristics and Source Apportionment of PM During Winter in Taiyuan].

To study the characteristics and sources of PM pollution in Taiyuan urban area in winter, PM and its chemical components (water-soluble ions, carbon components, and trace elements) and gaseous pollutants (SO, NO) were monitored by online instruments in January 2017. Combined with meteorological data, the characteristics of PM and its chemical components were analyzed. Also, source apportionment of PM was conducted by using positive matrix factorization (PMF).

[Concentration Characteristics and Sources of Trace Metals in PM During Wintertime in Beijing].

To study the characteristics and sources of trace metals in PM during wintertime in Beijing, PM samples were collected from December 2014 to January 2015 by a middle volume sampler in the urban area of Beijing for 30 consecutive days. The mass concentration of PM was measured by filter membrane weighting method, and 16 kinds of trace metals were determined by inductively couple plasma-mass spectrometry (ICP-MS). In addition, the pollution characteristics and sources of trace metals were analyzed by enrichment factor (EF) method and factor analysis, respectively.