Emission characteristics and spatial distribution of road fugitive dust in Tianjin, China

In this study,road dusts from the central area of Tianjin,China were collected according to the different types of roads,and the vehicle structure and the traffic flow were investigated.Based on the U.S.EPA AP-42 road dust emission factor model,discharging factors were analyzed and their emissions were calculated.In the meantime,the spatial distribution of dust emissions was drawn with Mapinfo.The calculation results showed that the silt loading of the ring road,the backbone road,the minor arterial road and spur tracks in the Tianjin central area was 0.30,0.40,0.64,and 2.02 g/m2,respectively.The highest PM10 emission intensity taken place in the ring road was 30.7 kg/(km.d),and their decreasing sequence was the backbone road the minor arterial road spur tracks.The road dust emission in the Tianjin central area was up to 27985 tons per year,and the PM10 emission was up to 5372 tons per year.The highest emission of the middle ring road area appeared in the Heping district,because of the dense traffic.The emission around the Heping district was being decreased gradually.