Inhalableparticulate matter (PM2.5 and PM10) samples were collected from four different grades of roads during the spring and summer of 2015 in Tianjin and 16kinds of inorganic elements were analyzed.The results showed that the average mass concentrations of PM2.5 and PM10 in the spring were significantly higher than that in summer.The ratios of PM2.5/PM10 by the roadside were lower than that of non-roadside environment,and the pollution of the minor arterial and the express way were more serious in PM2.5 and PM10,respectively.Element concentration analysis showed that the crustal elements (such as Si、Al、Ca) concentrations in PM2.5 and PM10 were the highest.The minor arterial and the expressway were effected seriously by artificial elements,while the outer loop was effected lightly.Enrichment factor in both PM2.5 and PM10 analysis showed thatthe enrichment factor ratio of Pb,Zn,Cu,Sb,Sn and Cd were greater than 10,which were highly enriched by the roadside.Kruskal-Wallis H test proved that the enrichment factor of these elements of PM2.5 showed significant differences among the four types of roads.And the minor arterial was effected seriously by vehicle pollution.There were differences among the factor analysis results of PM2.5 and PM10.The factor analysis in PM2.5 indicated that open source (soil,air-born particulate,road dust and construction dust),vehicle emission (exhaust emission and non-exhaust emission),combustion source and industrial emissions were primary sources in this area during the sampling period,in which vehicle emission source accounted for the highest proportion of anthropogenic pollution.
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