Concentration of PM2.5 in Shenyang traffic policemen working places.SitesNumber of samplesPM2.5 (μg/m3)x¯±sRangeField90162.7 ± 46.631.6–287.2Non-field9051.5 ± 59.112.4–160.3Full-size tableTable optionsView in workspaceDownload as CSV
3.2. Chemical composition of PM2.5
We analyzed the chemical composition of PM2.5 in heavy traffic CGP 20712 in the winter and summer. Toxic heavy metals and polycyclic aromatic hydrocarbon substances are the main compositions of PM2.5 that induce the production of free radicals in the body which cause DNA damage. The analysis identified that micronutrients PM2.5 contains a large amount of heavy metals for example, Mn, Zr, Cu, Cr and Ca and polycyclic aromatic hydrocarbon substances like anthracene, chrysene and benzo(a)pyrene (Table 2 and Table 3). Composition of PM2.5 in winter and summer was alike in many materials including Zr, P, Fe, Ba, naphthalene, acenaphthylene, and dibenzo(a,n)anthracene. However, some materials were much abundant in winter for instance Na, Mg, SO42 −, NO3−, Indeno(1,2,3-cd)pyrene, chrysene and benzo(k)fluoranthene.