Emission Factors And Emission Characteristics Of Paved Roads Fugitive Dust In Chongqing Urban

With the fast development of China’s economic,the environmental pollution becomes more and more seriously,especially the problem of air pollution is much concerned.As one of China’s municipalities,the problem of air pollution in Chongqing is very important.Current the problem of air pollution mainly leads by particulate pollution.The particulate pollution comes from industrial production,transportion,coal combustion,and so on.The fugitive dust pollution in the city accounts for a larger proportion of atmospheric particulate pollution.The research shows that road fugitive dust is an important source of fugitive dust in the city.Road fugitive dust not only affects the atmospheric visibility and formates haze weather,but also has serious harmful to human health.In order to improve the city’s air quality,it’s necessary to control road fugitive dust.Therefore,exploring the emission characteristics of road fugitive dust in Chongqing urban paved roads will provide theoretical and base data to support the controling of road fugitive dust in the city.The main contents of research include following tips:Firstly,based on the related researchs at home and abroad,the road fugitive dust samples of 36 different grade paved roads in Chongqing urban are collected in 4 different seasons in 1 year.With the subsequent analysis and calculation,the silt loading of different grade paved roads in Chongqing urban is got,and the silt loading of main road,secondary road,branch road is 0.872g/m2,1.199 g/m2,1.463 g/m2.Secondly,based on the AP-42 model by EPA and according to the road silt loading and road level data measured in the field,the emission factors of different grade paved roads in Chongqing urban are estimated. The emission factors of TSP,PM10,PM2.5 in main road are 7.601g/VKT,1.459g/VKT,0.353g/VKT;The emission factors of TSP, PM10,PM2.5 in secondary road are 8.840g/VKT,1.697g/VKT,0.411g/VKT;The emission factors of TSP,PM10,PM2.5 in branch road are 9.120g/VKT,1.751g/VKT,0.424g/VKT.Thirdly,according to the road fugitive dust emission factors and survey datas,the emission intensity and emission amount of road fugitive dust of different grade paved roads in Chongqing urban is estimated.The emission intensity of TSP,PM10,PM2.5 in main road is 330.628kg/(km·d),63.464kg/(km·d),15.352kg/(km·d);The emission intensity of TSP,PM10,PM2.5 in secondary road is 81.360kg/(km·d),34.812kg/(km·d),8.422kg/(km·d);The emission intensity of TSP, PM10, PM2.5 in branch road is 47.893kg/(km·d),9.193kg/(km·d),3.559kg/(km·d).The emission amount of TSP,PM10,PM2.5 in main road is 1643.883 t,315.543 t,76.330 t.The emission amount of TSP,PM10,PM2.5 in secondary road is 1424.459 t,274.000 t,66.288 t.The emission amount of TSP,PM10,PM2.5 in branch road is 726.577 t,139.465 t,53.993 t.The emission amount in one year of TSP, PM10, PM2.5 of all level paved roads in Chongqing urban is 3794.979 t,729.008 t,196.611 t.Finally,the collected road fugitive dust samples on the spot are analysed by XRD,the result shows that Si O2,Al2O3,Fe2O3,Ca O,Mg O are the main components of different grade paved road fugitive dust in Chongqing urban.