Characteristics Of Road Dust Emission In Shijiazhuang City

Air quality is paid more attention in Shijiazhuang,there are many pollution sources such as industrial production,coal combustion,suspension dust.And road dust is an important source of urban particulate matter.This study concentrate on road dust emission characteristics.Road dust samples were collected by using TRAKER system for monitoring background concentration of PM_2.5 and PM₁₀ around paved vehicle lane and the concentration of dust resuspended by a driving automotive vehicle at Shijiazhuang city.And quantitate the silt loading,emission factor and emission strength of paved road,in addition,analyse the source of chemical compositions.The main conclusions are as follow:1)Silt loading of expressway,main trunk road,secondary trunk road and branch road of Shijiazhuang city in winter were 0.48 g·m^-2,0.61 g·m^-2,0.08 g·m^-2,1.59 g·m^-2,respectively;in spring:2.32 g·m^-2,1.21 g·m^-2,1.07 g·m^-2,1.99 g·m^-2;in summer:0.66g·m^-2,0.47 g·m^-2,0.48 g·m^-2,0.46 g·m^-2;in autumn:0.82 g·m^-2,0.45 g·m^-2,0.82 g·m^-2,0.48 g·m^-2.2)Through the research of road dust emission factor and emission inventory in Shijiazhuang city,typical road dust emission characteristics of PM_2.5 and PM₁₀ were obtained.Road dust emission factors in winter:0.06⁰.80 g·?VKT?^-1,0.14¹.96g·?VKT?^-1;in spring:0.64¹.62 g·?VKT?^-1,1.94³.89 g·?VKT?^-1;in summer:0.18⁰.44g·?VKT?^-1,0.91¹.35 g·?VKT?^-1;in autumn:0.22¹.02 g·?VKT?^-1,0.86².23 g·?VKT?^-1.3)Results showed that Cu?Cd?Mo?Ca and Sb were extremely high enrichment in PM_2.5 and PM₁₀;And the range of NO₃^-/SO₄^2-is:fall>winter>spring>summer;The range of OC/EC in PM_2.5 were 5.8¹0.5,5.3²0.2,3.7¹7.9 and 2.4³.3,in PM_2.5 were3.1¹1.1,4.3¹7.5,4.9¹2.9 and 2.4³.1.This study has great significance in region road dust emission inventory construction and provides the basic scientific data support for control measurement decision.