Emission Characteristics of Road Dust-Fall in Huhhot Metropolitan Area

PM10(Particle matter less than 10 μm) has been the primary pollutant to China city's air quality in recent years,while fugitive road dust is one of the main sources.Emission characteristics study is the basis of air quality modeling,cost-benefit of control practices,control concept and environmental management.In order to investigate emission characteristics of RFD in Huhhot metropolitan area,thirty road dust-fall(DF) monitoring sites and five background monitoring sites were established,and monitoring was conducted from September 2008 to August 2009.The difference of road dust fall(DFr) and background dust fall(DFb) was defined as dust fall increment(ΔDF).The results indicated that ΔDF of ring road,major arterial,minor arterial and collector were 32.6,26.5,22.9 and 22.6 t/(km2·30 d),respectively,the ratio was 100:81:70:69,and ratio of ΔDF caused by single motorcar was 1.58∶1.00∶1.22∶3.16.From the point of the seasonal variation,the smallest appear in spring,and,and the ΔDF is not very different in summer,autum and winter,the ratio was 0.88∶1.00∶1.00∶0.99 for spring,summer,autum and winter.From the spatial distribution point of view,there is no obvious regional characteristics based on dust-fall monitor.